SOLUTION: Amy has $325 in 39 bills of $5 and $10 denominations. What is the quantity of $5 bills that Amy has?

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Question 878001: Amy has $325 in 39 bills of $5 and $10 denominations. What is the
quantity of $5 bills that Amy has?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
F%2BT=39
.
.
.
5F%2B10T=325
F%2B2T=65
Subtract eq. 1 from eq. 2,
F%2B2T-F-T=65-39
T=26
Then,
F=39-26
F=13
Thirteen $5 and twenty-six $10 bills.