Super market<br /> Diane Guo<br /> A group of people went to supermarket to buy fruits. 6 of them bought apple and pineapple. 16 of them bought apple. 23 of them bought only pineapple. And 3 of them bought all three kinds of fruits. How many people are there?<br /> <br />Answer: <br /> # Read the question carefully.<br /> # Decide what you are asked to find.<br /> How many people are there?<br /> # Looking for information that might be helpful.<br /><ul><li>6 of them bought apple and pineapple.
3 of them bought all three kinds of fruits.</li></ul> # Decide on the method you will use.<br /> Venn diagram<br />W A= appleP= pineappleW= watermelon 23 P36228600312420 # 15151105172710<br />A7<br />Answer: 39<br /># Make sure your answer is reasonable.<br /> The question said, 23 ONLY bought pineapple, so don’t need to care about that. 6 bought apple and pineapple, so the apple one and the pineapple one have to minus 6. So 7+6+3+23=39 <br />