GRE Quantitative Practice Questions — Standard Multiple-choice Format
Question
3
If a + b – c = d, and if a – b + c = e, then which of the following represents the value of a ?
(A) 
(d + e) (B) d – e (C) 2d + e
Answer and Analysis
The correct response is (A). The quickest way to solve for a here is with the addition-subtraction method. Add corresponding terms together from each equation, then isolate a by dividing both sides of the equation by 2:
