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 be accurate as possible. Think before you answer.
5
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.

.

So, the final answer is 5