ISEE Mathematics Achievement Question 205: Answer and Explanation

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Question: 205

11. Paul has a garden that is 4 meters by 7 meters. If he uses 2 ounces of fertilizer per square meter, how many ounces must he use?

  • A. 42 oz
  • B. 44 oz
  • C. 50 oz
  • D. 56 oz

Correct Answer: D

Explanation:

D is correct. Calculate the number of square meters in the garden and then determine how many ounces of fertilizer are needed. The area of a rectangle is calculated by multiplying the length × the width. So the area of the garden is 4 × 7 = 28 m2. Paul needs 2 oz of fertilizer for every square meter, so 2 × 28 = 56 oz.

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