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Mathematics > Standard Multiple Choice

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

Milk costs x cents per half-gallon and y cents per gallon. If a gallon of milk costs z cents less than 2 half-gallons, which of the following equations must be true?

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Explanation

The cost of a gallon of milk (y cents) is equal to z cents less than the cost of 2 half-gallons ((2 times x) cents). This can be written algebraically as y = (2 times x) minus z. Subtracting y from both sides of the equation yields (2 times x) minus y minus z = 0.

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