ISEE Mathematics Achievement Question 109: Answer and Explanation
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Question: 109
10. A car owner finds he needs 12 gallons of gas for each 120 miles he drives. If he has his carburetor adjusted, he will need only 80% as much gas. How many miles will 12 gallons of gas then last him
- A. 90
- B. 96
- C. 150
- D. 160
Correct Answer: C
Explanation:
The correct answer is (C). Right now, he gets 120 mi. ÷ 12 gal. = 10 mpg. With 80% more efficiency, he will need 80% of 12, or 9.6 gal. to go 120 miles. He will then get 120 mi. ÷ 9.6 gal. = 12.5 mpg.
12 gal. × 12.5 mpg = 150 miles on 12 gal.