15 x $5.15 = 77.25
so, ben make $77.25 a week
if you do 77.25 x 6 = 463.5
so, he will have to work 6 weeks to have enough money beacause
77.25 x 5 = 386.25 is how much he would ake in 5 weeks wich is not enough money so he has to work 1 more week then he can buy the game console
So, Ben will work about 6 weeks to get enough money to buy the console.