# Math Help - Fraction Equation

1. ## Fraction Equation

A sum total of \$5.50, is made up of 17 coins. Some of which were 20 cent coins, and the rest 50 cent coins. How many coins of each variety were there?

I know this is basic, but I can't see the way to write it up the best.

Thanks

2. Let x be the the number of 20 cent coins and y be the number of 50 cent coins.

Now $x+y = 17$ and $0.20x +0.50y = 5.50$

Solve using either elimination or substitution.