SOLUTION: A purse contains $3.90 made up of dimes and quarters. If there are 21 coins in all, how many dimes and quarters were there?

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Question 1044622: A purse contains $3.90 made up of dimes and quarters. If there are 21 coins in all, how many dimes and quarters were there?
Answer by jorel555(1290) About Me  (Show Source):
You can put this solution on YOUR website!
Let q be quarters. Then
25q+10(21-q)=390
25q+210-10q=390
15q=180
q=12 quarters
21-q=9 dimes. ☺☺☺☺