SOLUTION: You have 13 coins worth $2.20. All your coins are dimes or quarters. How many of each do you have

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Question 1064520: You have 13 coins worth $2.20. All your coins are dimes or quarters. How many of each do you have
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
Let d be dimes, and q be quarters. Then:
d+q=13 and
10d+25q=220
So:
10d+25q=220
10d+10q=130
15q=90
q=6
I have 6 quarters, and 7 dimes. ☺☺☺☺