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Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

A gasoline tank on a certain tractor holds 16 gallons of gasoline. If the tractor requires 7 gallons to plow 3 acres, how many acres can the tractor plow with a tankful of gasoline?

(A) 6 and (6/7)
(B) 7 and (1/6)
(C) 7 and (1/3)
(D) 10 and (2/3)
(E) 37 and (1/3)

答案和解析

答案：A

解析：

In the question, you are told that 7 gallons of gasoline can plow 3 acres and you are asked to find how many acres, call it x, can be plowed by 16 gallons. You can set up a ratio of the number of gallons of gasoline used to the number of acres plowed. Therefore, you have 7/3 = 16/x. Cross-multiplying and solving for x gives you the answer of x = 48/7 acres, or 6 and (6/7) acres.