SOLUTION: I have 13 coins consisting of quarters and dimes. The total value of the coins is $2.50. How many of each kind do I have.

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Question 1049259: I have 13 coins consisting of quarters and dimes. The total value of the coins is $2.50. How many of each kind do I have.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.Q%2BD=13 Total number of coins
.
.
25Q%2B10D=250 Total value of coins
2.5Q%2B2D=50
Subtract two times eq. 1 from eq. 2,
5Q%2B2D-2Q-2D=50-2%2813%29
3Q=24
Q=8
Then from eq. 1,
8%2BD=13
D=5