ISEE Mathematics Achievement Question 288: Answer and Explanation

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Question: 288

3. A pet goat eats 2 pounds of goat food and 1 pound of grass each day. When the goat has eaten a total of 15 pounds, how many pounds of grass will it have eaten?

  • A. 3
  • B. 4
  • C. 5
  • D. 15

Correct Answer: C

Explanation:

C The ratio of goat food to grass is 2:1, so place this in the ratio row of the box. The question also states that the goat eats 15 total pounds per day, so place this number in total column of the actual number row. To find the multiplier, find the total of the ratio, 2 + 1 = 3, and find what times 3 equals 15. 3 × 5 = 15, so the multiplier is 5. The question asks for the total amount of grass the goat eats, so 1 × 5 = 5. The correct answer is (C).

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