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.
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Let x be the the number of 20 cent coins and y be the number of 50 cent coins.
Solve using either elimination or substitution.
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