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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?

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Think of setting up this problem as a ratio of the form “a is to b as c is to d,” which is mathematically equivalent to a over b = c over d. If 7 gallons of gasoline can plow 3 acres, then a over b is 7 over 3. Knowing that it represents the same proportion, what is c over d? Since there will only be one unknown variable, that variable can be solved for directly to find the answer.

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