GRE Sample Test 2 Quantitative Reasoning 1

Plug In. If a = 3, b = 6, c = 3, d = 5, and e = 10, the value of the equation is $\frac{10\left(3+\frac{6}{3}\right)}{5}$ = 10.
Half of 10 is your target of 5. Try doubling each variable to find the one that yields 5. The only one that works is doubling d to 10 so that the equation is $\frac{\left(10\right)\left(3+\frac{6}{3}\right)}{10}$ = 5.