SAT Math Multiple Choice Question 166: Answer and Explanation

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Question: 166

1. An air pump at a gas station dispenses 90 pounds of air for $0.25. Which of the following expressions gives the number of pounds of air dispensed, P, for d dollars?

  • A. P = d + 90
  • B. P = d + 360
  • C. P = 90d
  • D. P = 360d

Correct Answer: D

Explanation:

D Whenever there are variables in the question and in the answers, think Plugging In. Let d = 2. For $1 the air pump dispenses 90 × 4 = 360 pounds of air. Therefore, for $2 the air pump will dispense 360 × 2 = 720 pounds of air. Plug in 2 for d in the answer choices to see which answer equals 720. Choice (A) becomes P = 2 + 90 = 92. Eliminate (A). Choice (B) becomes P = 2 + 360 = 362. Eliminate (B). Choice (C) becomes P = 90(2) = 180. Eliminate (C). Choice (D) becomes P = 360(2) = 720. Therefore, the correct answer is (D).

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