SOLUTION: Tabitha has $3.20 in quarters and nickels. If she has 20 coins in all, how many quarters does she have?
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Question 370210: Tabitha has $3.20 in quarters and nickels. If she has 20 coins in all, how many quarters does she have?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let Q be the number of quarters, D dimes.
1.
.
.
2.
Multiply eq. 1 by -2 and add to eq. 2,
Then from eq. 1,
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