He needs to sell 100 souvenirs
Here, we want to know the number of souveniers John has to sell
Let the number of souvenier he sold at the game be s
At a rate of $0.25 per souvenier, the amount earned on souveniers for s souveniers will be;
[tex]0.25\times s\text{ = \$0.25s}[/tex]Now, if we added this to the amount he earns per game, we will have the total $35 earned for working at one game
Thus, mathematically;
[tex]\begin{gathered} 0.25s\text{ + 10 = 35} \\ 0.25s\text{ = 35-10} \\ 0.25s\text{ = 25} \\ s\text{ = }\frac{25}{0.25} \\ s\text{ = 100} \end{gathered}[/tex]
