ISEE Mathematics Achievement Question 297: Answer and Explanation

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Question: 297

9. Dwan measured a total of 245 inches of rainfall in his hometown over one week. During the same week the previous year, his hometown had a total of 196 inches. How many more inches was the daily amount of rainfall for the week this year than the week last year?

  • A. 6
  • B. 7
  • C. 8
  • D. 9

Correct Answer: B

Explanation:

B Even though this problem doesn't use the word average, you can still use Average Pies to help solve this question. The problem gives information about the weekly amount of rain, but the question asks about the daily amount instead. The daily amount will be the average (i.e., the amount of rain per day). Place 245 in the total spot of the first Average Pie and 7 in the # of items place. That gives you an average of = 35, which is the average daily amount for the current year. Do the same for the previous year in a second Average Pie. This time, 196 goes in the total spot and 7 goes in the # of items place. That equals an average of = 28. The question asks for how many more inches, so you will need to subtract the two daily amounts of rain: 35 - 28 = 7. The correct answer is (B).

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