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?
(A)
(B)
(C)
(D)
(E)
The Correct answer is C.
Explanation
The cost of a gallon of milk is equal to cents less than the cost of half-gallons . This can be written algebraically as . Subtracting from both sides of the equation yields .