ISEE Mathematics Achievement Question 67: Answer and Explanation
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Question: 67
11. A square is changed into a rectangle by increasing its length 10% and decreasing its width 10%. Its area
- A. remains the same.
- B. decreases by 10%.
- C. increases by 1%.
- D. decreases by 1%.
Correct Answer: D
Explanation:
The correct answer is (D).
Assign arbitrary values to solve this problem:
A square 10 ft. × 10 ft. = 100 sq. ft.
A rectangle 9 ft. × 11 ft. = 99 sq. ft.
100 - 99 = 1; 
= 1%