標題範例：Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
The C cars in a car service use a total of g gallons of gasoline per week. If each of the cars uses the same amount of gasoline, then, at this rate, which of the following represents the number of gallons used by 5 of the cars in 2 weeks?
(A) 10cg
(B) 2g/5c
(C) 5g/2c
(D) g/10c
(E) 10g/c
謎底：E
【剖析】The car service uses a total of g gallons of gasoline per week, and each of the cars uses the same amount of gasoline, so each of the c cars uses g/c gallons of gasoline per week. Therefore, 5 of the cars use a total of 5g/c gallons per week. It follows that 5 of the cars use (2)(5g/c)=10g/c gallons of gasoline in 2 weeks.
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