SOLUTION: A money box contains only 10-cent and 20-cent coins. There are 34 coins with a total value of $5.40. How many coins of each?

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Question 1090471: A money box contains only 10-cent and
20-cent coins. There are 34 coins with a
total value of $5.40.
How many coins of each?

Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
(Dollars, $, have no "20-cent" coin.)

system%28x%2By=34%2C10x%2B20y=540%29
-
x%2B2y=54
%2834-y%29%2B2y=54
34%2By=54
y=20------------the number of "20-cent" coins