SOLUTION: A money box contains only 10-cent and 20-cent coins. There are 22 coins with a total value of $2.90. How many coins of each?

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Question 1071955: A money box contains only 10-cent and
20-cent coins. There are 22 coins with a
total value of $2.90.
How many coins of each?
Answer by josgarithmetic(39625) About Me  (Show Source):
You can put this solution on YOUR website!
"20-cent coins"?

x of 10-cent coins
y of 20-cent coins
system%28x%2By=22%2C0.1x%2B0.2y=2.9%29

The money equation becomes x%2B2y=29.

%28x%2B2y%29-%28x%2By%29=29-22
highlight%28y=7%29
-
highlight%28x=15%29