APDSMK WEEK 1 PUZZLE CREATIVE THINKING.pptx

Copyright © 2019 UNIMY | Private & Confidential
FFGC1013
CREATIVE
THINKING

PUZZLE GAME

The Digital Technology University
PUZZLE 1
There are two ducks in front of a duck, two ducks
behind a duck and a duck in the middle. How many
ducks are there?

PUZZLE ANSWER
Three. Two ducks are in front of the last duck; the
first duck has two ducks behind; one duck is between
the other two.

PUZZLE 2
Five people were eating apples, A finished before B,
but behind C. D finished before E, but behind B.
What was the finishing order?

PUZZLE ANSWER
CABDE. Putting the first three in order, A finished in
front of B but behind C, so CAB. Then, we know D
finished before B, so CABD. We know E finished after
D, so CABDE.

PUZZLE 3
• Jack is looking at Anne. Anne is looking at George.
Jack is married, George is not, and we don’t know if
Anne is married. Is a married person looking at an
unmarried person?

PUZZLE ANSWER
Yes. If Anne is married, then she is married and
looking at George, who is unmarried. If Anne is
unmarried, then Jack, who is married, is looking at
her. Either way, the statement is correct.

PUZZLE 4
A man has 53 socks in his drawer: 21 identical blue,
15 identical black and 17 identical red. The lights are
out and he is completely in the dark. How many
socks must he take out to make 100 percent certain
he has at least one pair of black socks?

PUZZLE ANSWER
40 socks. If he takes out 38 socks (adding the two
biggest amounts, 21 and 17), although it is very
unlikely, it is possible they could all be blue and red.
To make 100 percent certain that he also has a pair
of black socks he must take out a further two socks.

PUZZLE 5
Friday. The “day before tomorrow” is today; “the day
before two days after” is really one day after. So if
“one day after today is Saturday,” then it must be
Friday.

PUZZLE ANSWER
The day before two days after the day before
tomorrow is Saturday. What day is it today?

PUZZLE 6
This “burning rope” problem is a classic logic puzzle.
You have two ropes that each take an hour to burn,
but burn at inconsistent rates. How can you measure
45 minutes? (You can light one or both ropes at one
or both ends at the same time.)

PUZZLE ANSWER
Because they both burn inconsistently, you can’t just light one
end of a rope and wait until it’s 75 percent of the way
through. But, this is what you can do: Light the first rope at
both ends, and light the other rope at one end, all at the same
time. The first rope will take 30 minutes to burn (even if one
side burns faster than the other, it still takes 30 minutes). The
moment the first rope goes out, light the other end of the
second rope. Because the time elapsed of the second rope
burning was 30 minutes, the remaining rope will also take 30
minutes; lighting it from both ends will cut that in half to 15
minutes, giving you 45 minutes all together.

PUZZLE 7
You’re at a fork in the road in which one direction
leads to the City of Lies (where everyone always lies)
and the other to the City of Truth (where everyone
always tells the truth). There’s a person at the fork
who lives in one of the cities, but you’re not sure
which one. What question could you ask the person
to find out which road leads to the City of Truth?

PUZZLE ANSWER
“Which direction do you live?” Someone from the
City of Lies will lie and point to the City of Truth;
someone from the City of Truth would tell the truth
and also point to the City of Truth.

PUZZLE 8
A girl meets a lion and unicorn in the forest. The lion
lies every Monday, Tuesday and Wednesday and the
other days he speaks the truth. The unicorn lies on
Thursdays, Fridays and Saturdays, and the other days
of the week he speaks the truth. “Yesterday I was
lying,” the lion told the girl. “So was I,” said the
unicorn. What day is it?

PUZZLE ANSWER
Thursday. The only day they both tell the truth
is Sunday; but today can’t be Sunday because the
lion also tells the truth on Saturday (yesterday).
Going day by day, the only day one of them is lying
and one of them is telling the truth with those two
statements is Thursday.

PUZZLE 9
There are three people (Alex, Ben and Cody), one of
whom is a knight, one a knave, and one a spy. The
knight always tells the truth, the knave always lies,
and the spy can either lie or tell the truth. Alex says:
"Cody is a knave.” Ben says: "Alex is a knight.” Cody
says: "I am the spy.” Who is the knight, who the
knave, and who the spy?

PUZZLE ANSWER
We know Ben isn’t telling the truth because if he
was, there would be two knights; so Ben could be
either the knave or the spy. Cody also can’t be the
knight, because then his statement would be a lie. So
that must mean Alex is the knight. Ben, therefore,
must be the spy, since the spy sometimes tells the
truth; leaving Cody as the knave.

PUZZLE 10
A farmer wants to cross a river and take with him
a wolf, a goat and a cabbage. He has a boat, but it
can only fit himself plus either the wolf, the goat or
the cabbage. If the wolf and the goat are alone on
one shore, the wolf will eat the goat. If the goat and
the cabbage are alone on the shore, the goat will eat
the cabbage. How can the farmer bring the wolf, the
goat and the cabbage across the river without
anything being eaten?

PUZZLE ANSWER
First, the farmer takes the goat across. The farmer
returns alone and then takes the wolf across, but
returns with the goat. Then the farmer takes the
cabbage across, leaving it with the wolf and returning
alone to get the goat.

PUZZLE 11
Alice and Ben cross first in two minutes, and Alice
crosses back alone with the torch in one minute.
Then the two slowest people, Cindy and Don, cross in
eight minutes. Ben returns in two minutes, and Alice
and Ben return in two minutes. They just made it in
15 minutes exactly.

PUZZLE 12
Susan and Lisa decided to play tennis against each
other. They bet $1 on each game they played. Susan
won three bets and Lisa won $5. How many games
did they play?

PUZZLE ANSWER
Eleven. Because Lisa lost three games to Susan, she
had lost $3 ($1 per game). So, she had to win back
that $3 with three more games, then win another
five games to win $5.

PUZZLE 13
If five cats can catch five mice in five minutes, how
long will it take one cat to catch one mouse?

PUZZLE ANSWER
Five minutes. Using the information we know, it
would take one cat 25 minutes to catch all five mice
(5x5=25). Then working backward and dividing 25 by
five, we get five minutes for one cat to catch each
mouse.

PUZZLE 14
There is a barrel with no lid and some wine in it.
“This barrel of wine is more than half full,” says the
woman. “No, it's not,” says the man. “It’s less than
half full.” Without any measuring implements and
without removing any wine from the barrel, how can
they easily determine who is correct?

PUZZLE ANSWER
Tilt the barrel until the wine barely touches the lip of
the barrel. If the bottom of the barrel is visible then
it is less than half full. If the barrel bottom is still
completely covered by the wine, then it is more than
half full.

PUZZLE 15
There are three bags, each containing two marbles.
Bag A contains two white marbles, Bag B contains
two black marbles, and Bag C contains one white
marble and one black marble. You pick a random bag
and take out one marble, which is white. What is the
probability that the remaining marble from the same
bag is also white?

PUZZLE ANSWER
2 out of 3. You know you don’t have Bag B. But
because Bag A has two white marbles, you could
have picked either marble; if you think of it as four
marbles in total from Bags A and C, three white and
one black, you’ll have a greater chance of picking
another white marble

PUZZLE 16
Three men are lined up behind each other. The tallest man is
in the back and can see the heads of the two in front of him;
the middle man can see the one man in front of him; the man
in front can’t see anyone. They are blindfolded and hats are
placed on their heads, picked from three black hats and two
white hats. The extra two hats are hidden and the blindfolds
removed. The tallest man is asked if he knows what color hat
he’s wearing; he doesn’t. The middle man is asked if he
knows; he doesn’t. But the man in front, who can’t see
anyone, says he knows. How does he know, and what color
hat is he wearing?

PUZZLE ANSWER
Black. The man in front knew he and the middle
man aren’t both wearing white hats or the man in
the back would have known he had a black hat (since
there are only two white hats). The man in front also
knows the middle man didn’t see him with a white
hat because if he did, based on the tallest man’s
answer, the middle man would have known he
himself was wearing a black hat. So, the man in front
knows his hat must be black.

PUZZLE 17
There are three crates, one with apples, one with
oranges, and one with both apples and oranges
mixed. Each crate is closed and labeled with one of
three labels: Apples, Oranges, or Apples and
Oranges. The label maker broke and labeled all of the
crates incorrectly. How could you pick just one fruit
from one crate to figure out what’s in each crate?

PUZZLE ANSWER
Pick a fruit from the crate marked Apples and Oranges. If that
fruit is an apple, you know that the crate should be labeled
Apples because all of the labels are incorrect as they are.
Therefore, you know the crate marked Apples must be
Oranges (if it were labeled Apples and Oranges, the Oranges
crate would be labeled correctly, and we know it isn’t), and
the one marked Oranges is Apples and Oranges. Alternately, if
you picked an orange from the crate marked Apples and
Oranges, you know that crate should be marked Oranges, the
one marked Oranges must be Apples, and the one marked
Apples must be Apples and Oranges.

PUZZLE 18
A teacher writes six words on a board: “cat dog has
max dim tag.” She gives three students, Albert,
Bernard and Cheryl each a piece of paper with one
letter from one of the words. Then she asks, “Albert,
do you know the word?” Albert immediately replies
yes. She asks, “Bernard, do you know the word?” He
thinks for a moment and replies yes. Then she asks
Cheryl the same question. She thinks and then
replies yes. What is the word?

PUZZLE ANSWER
Dog. Albert knows right away because he has one of the
unique letters that only appear once in all the words: c o
h s x i. So, we know the word is not “tag.” All of these
unique letters appear in different words, except for “h”
and “s” in “has,” and Bernard can figure out what the
word is from the unique letters that are left: t, g, h, s.
This eliminates “max” and “dim.” Cheryl can then narrow
it down the same way. Because there is only one unique
letter left, the letter “d,” the word must be “dog.” (For
more on this answer, watch the video below.)

PUZZLE 19
You have five boxes in a row numbered 1 to 5, in
which a cat is hiding. Every night he jumps to an
adjacent box, and every morning you have one
chance to open a box to find him. How do you win
this game of hide and seek?

PUZZLE ANSWER
Check boxes 2, 3, and 4 in order until you find him. Here’s why: He’s either
in an odd or even-numbered box. If he’s in an even box (box 2 or 4) and
you check box 2 and here’s there, great; if not you know he was in box 4,
which means the next night he will move to box 3 or 5. The next morning,
check box 3; if he’s not there that means he was in box 5 and so the next
night he’ll be in box 4, and you’ve got him. If he was in an odd-numbered
box to begin with (1, 3, or 5), though, you might not find him in that first
round of checking boxes 2, 3 and 4. But if this is the case, you know that
on the fourth night he’ll have to be in an even-numbered box (because he
switches every night: odd, even, odd, even), so then you can start the
process again as described above. This means if you check boxes 2, 3, and
4 in that order, you will find him within two rounds (one round of 2, 3, 4;
followed by another round of 2, 3, 4). For more on this answer, watch the
video below.

PUZZLE 20
The “Monty Hall” problem was made famous when it
appeared in Parade magazine’s “Ask Marilyn” column in 1990,
and it was so counterintuitive it had everyone from high
school students to top mathematical minds questioning the
answer—but rest assured, the solution is accurate. Named for
the Let’s Make a Deal game show host, the puzzle goes like
this: You are given three doors to choose from, one of which
contains a car and the other two contain goats. After you’ve
chosen one but haven’t opened it, Monty, who knows where
everything is, reveals the location of a goat from behind one
of the other two doors. Should you stick with your original
choice or switch, if you want the car?

PUZZLE ANSWER
You should switch. At the beginning, your choice
starts out as a one in three chance of picking the car;
the two doors with goats contain 2/3 of the chance.
But since Monty knows and shows you where one of
the goats is, that 2/3 chance now rests solely with
the third door (your choice retains its original 1/3
chance; you were more likely to pick a goat to begin
with). So, the odds are better if you switch.

THANK YOU

APDSMK WEEK 1 PUZZLE CREATIVE THINKING.pptx

Recommended

Recommended

More Related Content

Recently uploaded

Recently uploaded (20)

Featured

Featured (20)

APDSMK WEEK 1 PUZZLE CREATIVE THINKING.pptx