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
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Let x be the the number of 20 cent coins and y be the number of 50 cent coins. Now $\displaystyle x+y = 17 $ and $\displaystyle 0.20x +0.50y = 5.50$ Solve using either elimination or substitution.
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