###Human: The girl scouts earned $30 total from selling delicious cookies. They want to go to the pool. It will cost them $2.50 per person to go and 10 people are going. What is the amount left?, ### Assistant: The girls paid $2.50/person * 10 people = $25.
The girls have $30 - $25 = $5 left. 
 So the answer is :  5