PSAT Math Multiple-Choice Question 754: Answer and Explanation
Question: 754
How many more kilograms (to the nearest hundredth) will a 2 cubic meter balloon that is filled with air weigh than an identical balloon that is filled with helium, given that helium has a density of and air has a density of
- A. 0.21
- B. 1.02
- C. 1.38
- D. 2.04
Correct Answer: D
Explanation:
(D) The weight of the balloon itself is irrelevant since the balloon is identical in both situations.
1.2 - 0.179 = 1.021 is the difference in density between the two balloons. Since you have a 2 cubic meter balloon, simply multiply 1.021 × 2 to give approximately 2.04.
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