Keenan and Chad are both selling cookie dough for a fundraiser. Although Keenan has already sold 8 tubs, Chad hasn't sold any yet. If Keenan starts selling 1 tub per day and Chad begins selling 5 tubs per day, they will eventually sell the same amount of cookie dough. How many days will that take?
8 + 1D = 5D where D is the days we are looking for
Subtract 1D from both sides
8 = 4D divide both sides by 4
2 = D
This makes sense
Keenan sells 8 + 1*(2) = 10 tubs by the end of the second day
Chase sells 5(2) = 10 tubs by the end of the second day