SSAT Math Question 188: Answer and Explanation
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Question: 188
7. How many more 9" × 9" linoleum tiles than 1' × 1' tiles will it take to cover a 12' × 12' floor?
- A. 63
- B. 98
- C. 112
- D. 120
Correct Answer: C
Explanation:
The correct answer is (C). A floor 12' × 12' is 144 sq. ft. in area, and would require 144 tiles that are each 1 foot by 1 foot. Twelve tiles would be placed along the width and length of the room. If 9" tiles are used, it requires 16 of them placed end to end to cover the length of the room. Therefore, it requires 16 × 16 tiles to cover the floor, or 256 tiles. It requires 112 more 9" tiles than 12" tiles to cover the floor.