SOLUTION: A piggy bank contains only 20c and 50c coins. There are 60 coins in total and their overall value is $18.60. Determine the contents of the piggy bank?

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Question 1142511: A piggy bank contains only 20c and 50c coins. There are 60 coins in total and their overall value is $18.60. Determine the contents of the piggy bank?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
20c coins?

x of 20c coins
y of 50c coins
x%2By=60, sixty coins
20x%2B50y=18.6

0.20%2860-y%29%2B0.50y=18.6, easier to find y first.

12-0.2y%2B0.5y=18.6
0.3y=18.6-12
0.3y=6.6
highlight%28y=22%29------------------the 50c coins
highlight%28x=38%29-----------------the 20c coins