This document provides examples for solving rate problems in two ways: using proportions or cross-multiplication, and by multiplying the given rate by the quantity. It presents five example rate problems - finding the cost of 9 pounds of grapes given the cost of 5 pounds, calculating the hay consumption of 20 cows based on the rate of 8 cows, and determining the time to type 450 words using a given words-per-minute rate. It instructs the reader to find the unit rates implied in each example and then re-solve the first two examples using multiplication instead of proportions.
1. Lesson 49.notebook January 14, 2013
Lesson 49:
FYI...We can solve rate problems 2 ways:
--with proportions (McDonald's arches)
--by multiplying by the unit rate
2. Lesson 49.notebook January 14, 2013
Examples (Lesson 49):
Solve the following by using a ratio box/proportion.
A) If 5 pounds of seedless grapes cost $3.80, how much would 9
pounds cost?
3. Lesson 49.notebook January 14, 2013
B) If 8 cows eat 200 pounds of hay a day, how many pounds of
hay would 20 cows eat in a day?
4. Lesson 49.notebook January 14, 2013
C) Don can type 135 words in 3 minutes. At that rate, how many
minutes would it take him to type 450 words?
5. Lesson 49.notebook January 14, 2013
D) Find the price per pound of grapes in "a", the pounds of hay per
cow in "b", and the words per minute in "c".
6. Lesson 49.notebook January 14, 2013
E) Solve examples "a" & "b" again using a rate instead of a
proportion.
