SOLUTION: Samantha has 30 coins, consisting of quarters and dimes, which in total $5.70. How much of each does she have?

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Question 899299: Samantha has 30 coins, consisting of quarters and dimes, which in total $5.70. How much of each does she have?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Number of Coins
Q%2BD=30
Total Value
25Q%2B10D=570
From the first equation,
Q=30-D
Substitute,
25%2830-D%29%2B10D=570
750-25D%2B10D=570
-15D=-180
D=12
Then,
Q%2B12=30
Q=18