<human>:  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?
<bot>: How many ounces of water are in each balloon? ** He will need 300 ounces of water because 100 x 3 = <<100*3=300>>300
How many bottles of water will he need? ** He will need 6 bottles because 300 / 50 = <<300/50=6>>6
How much will the water cost? ** This will cost $15 because 6 x 2.5 = <<6*2.5=15>>15
How much money does he have? ** He has $20 because 2 x 10 = <<2*10=20>>20
How much change will he have? ** He will get $5 in change because 20 - 15 = <<20-15=5>>5
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