ISEE Mathematics Achievement Question 30: Answer and Explanation

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Question: 30

2. Two rectangular boards each measuring 5 feet by 3 feet are placed together to make one large board. How much shorter will the perimeter be if the two long sides are placed together than if the two short sides are placed together

A. 2 feet
B. 4 feet
C. 6 feet
D. 8 feet

Correct Answer: B

Explanation:

The correct answer is (B). Perimeter = 2l + 2w

If the two long sides are together, the perimeter will be

5 + 3 + 3 + 5 + 3 + 3 = 22

t1-9a.tif

If the two short sides are together, the perimeter will be

3 + 5 + 5 + 3 + 5 + 5 = 26

t1-9b.tif

26 - 22 = 4 feet shorter

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