[Question]: A charcoal grill burns fifteen coals to ash every twenty minutes of grilling. The grill ran for long enough to burn three bags of coals. Each bag of coal contains 60 coals. How long did the grill run?
[Answer]: The grill burned 3 * 60 = 180 coals. It takes 20 minutes to burn 15 coals, so the grill ran for 180 / 15 * 20 = 240 minutes.
So the answer is 240.

[Question]: Paul went to a shop to buy some groceries. He bought some bread for $2, butter for $3, and juice for two times the price of the bread. He had $15 for his shopping. How much money did Paul have left?
[Answer]: The price of the juice was 2 * 2 = $4. So in total he paid for his shopping 2 + 3 + 4 = $9. That means he had 15 - 9 = $6 left.
So the answer is 6.

[Question]: Amanda and her family are going to re-paint all the walls inside their house. Before they get started they want to divide up the work. Since all the rooms in the house have different numbers and sizes of walls in them, they figure the fairest way to divide up the work is to count all the walls in the house and assign an equal number to each person. There are 5 people in Amanda's family, including herself. There are 9 rooms in the house. 5 of the rooms have 4 walls each. The other 4 rooms each have 5 walls each. To be fair, how many walls should each person in Amanda's family paint?
[Answer]:
First, Amanda needs to figure out how many walls there are in the house, 5 rooms x 4 walls each = 20 walls. The other 4 rooms have x 5 walls each = 20 walls. The house has 20 walls + 20 walls = 40 walls total. To divide the work equally between the 5 people, 40 walls / 5 people = 8 walls for each person.
So the answer is 8.