Marcus is having a water balloon party. He has 100 balloons. Each balloon holds 3 ounces of water. He can buy 50 ounces of water for $2.5 a bottle. If he walks into the store with 2 $10 bills, how much change will he have after he buys all the water he needs?
Let's think: He will need 300 ounces of water because 100 x 3 = 300. He will need 6 bottles because 300 / 50 = 6. This will cost $15 because 6 x 2.5 = 15. He has $20 because 2 x 10 = 20. He will get $5 in change because 20 - 15 = 5.. The answer is: 5.

A fixer uses 30% of the nails in a container to repair the kitchen. He also used 70% of the remaining nails in the container to repair the fence. If there were 400 nails in the container, how many nails are remaining?
Let's think: The fixer used 30 / 100 * 400 = 120 nails to fix the kitchen. The number of nails remaining in the container after he fixes the kitchen is 400 - 120 = 280. He also uses 70 / 100 * 280 = 196 of the nails remaining in the container to fix the fence. The total number of nails which the fixer hasn't used is 280 - 196 = 84.. The answer is: 84.

Wallace runs a beef jerky company. The company dries the jerky low and slow, so one batch of jerky takes all night to make. Each batch can make 10 bags of jerky. Wallace received a customer order for 60 bags of jerky. If he has 20 bags of jerky already made, how many days will it be before he can fulfill the customer’s order?
Let's think: Wallace already has 20 bags of jerky, so he needs to make 60 - 20 = 40 bags more. He can make 10 bags per day, so he needs 40 / 10 = 4 days to fulfill the customer’s order.. The answer is: 4.

Francine has five full boxes of crayons and 5 loose crayons, and her friend has 27 loose crayons. They need to put all of their loose crayons in a box. How many more boxes do they need if Francine has a total of 85 crayons?
Let's think:
Francine has 85 - 5 = 80 crayons in total that are in the boxes. Thus, each box of crayons is filled with 80 / 5 = 16 crayons. A total of 5 + 27 = 32 crayons need to be placed in the boxes. Therefore, they still need 32 / 16 = 2 boxes for the loose crayons.. The answer is: 2.