## Precalculus (6th Edition) Blitzer

The percentage of college men who play online games multiple times per day is $24\%$ and the percentage of college men who play online games once per day is $17\%$.
Step 1. Assume the percentage of college men who play online games multiple times per day is $x$ and the percentage of college men who play online games once per day is $y$. Step 2. Based on the given conditions, we can setup the system of equations as $\begin{cases} x+y=41 \\ x-y=7 \end{cases}$ Step 3. Add the two equations; we have $2x=48$ and $x=24$ percent; thus $y=x-7=17$ percent.