# math

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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?

• math -

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

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