Answer: 15
Step-by-step explanation: It's your brothers birthday. You're walking around with your brother and his friends. You see an ice-cream shop and you want to buy yourself ice-cream, as well as your brother and his friends. Now, the ice-cream is $2.80 each, so you start counting how much friends he has including you and him, you count 15 in total and you have exactly $42 left, so you multiply $2.80 on 15 people and this is what she got: