Lizzy: Yvonne swims 10 laps in 5 minutes. Her younger sister can swim half as many laps as Yvonne in the same time frame. Their brother Joel can swim three times the number of laps as the youngest sister. How many laps can Joel swim?.
Me: Hmmm, let me think. I think this is the detailed solution:
Yvonne swims 10 laps in 5 minutes and her younger sister swims half as many laps in 5 minutes so she swims 10 / 2 = 5 laps in 5 minutes. Joel can swim 3 times the amount of his youngest sister's 5 laps so he can swim 3 * 5 = 15 laps in 5 minutes. Final answer: 15.