SSAT Math Question 129: Answer and Explanation
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Question: 129
5. If the outer diameter of a metal pipe is 2.84 in. and the inner diameter is 1.94 in., the thickness of the metal is
- A. 0.45 in.
- B. 0.90 in.
- C. 1.42 in.
- D. 1.94 in.
Correct Answer: A
Explanation:
The correct answer is (A). The difference is 0.90 inches, but the outside diameter consists of two thicknesses of metal (one on each side). Therefore, the thickness of the metal is 0.90 ÷ 2 = 0.45 inches.