SAT Mathematics Practice Test 5

The value of c + d can be found by dividing both sides of the given equation by 3. This yields $\mathit{c}+\mathit{d}=\frac{5}{3}$Choice A is incorrect. If the value of $\mathit{c}+\mathit{d}$ is $\frac{3}{5}$,then $3\times \frac{3}{5}=5$; however,$\frac{9}{5}$is not equal to $5$.
Choice C is incorrect. If the value of $\mathit{c}+\mathit{d}$ is $3$, then $3\times 3=5;$ however, $$9 is not equal to $5$.
Choice D is incorrect. If the value of $\mathit{c}+\mathit{d}$ is $5$, then $3\times 5=5$; however, $15$ is not equal to $5$.