Question: Nelly wants to buy pizza for herself and her 14 friends. Each pizza costs $12 and can feed 3 people. If Nelly earns $4 a night babysitting the neighbors' kids, how many nights will she have to babysit to afford the pizza? Think carefully first, then make a decision:
She needs to buy 15 / 3 = 5 pizzas. The pizzas cost 5 * $12 = $60 total. It will take her $60 / $4 = 15 nights worth of babysitting to afford the pizza. So the answer is 15.