GRE Sample Test 2 Quantitative Reasoning 1

Plug the information given into the formula for the area of a triangle to learn more about the relationship between x and y: A =
$\frac{\mathit{b}\mathit{h}}{2}$ = $\frac{\mathit{x}\mathit{y}}{2}$ = 108.
The product of x and y is 216, so x needs to be a factor of 216. The only number in the answer choices that is not a factor of 216 is 5. The remaining choices are possible values of x.