math
posted by micaela on .
crusty bought balloons at 5 for $1 and sold them 3 for $1. if his profit from selling balloons was $20, how many balloons did he sell?
1 how much did crusty make for every balloon?
2 what open sentence (equation) would we wite to solve this?

He buys 5 for $ 1, so he pays 20 cents for each.
He sells 3 for $ 1, so he earns 33 cents on each.
Now the cost price is given as C(x) = .20x
The revenue is given as R(x) = .33x
He makes $20 by selling the balloons.
Hence 20 = .33x
x = 20/.33
x = 60.6
x = 60 balloons