SOLUTION: Gina's piggy bank contains $10 and $5 coins only. If there are 75 coins worth $450, how many coins each kind are there?

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Question 1089884: Gina's piggy bank contains $10 and $5 coins only. If there are 75 coins worth $450, how many coins each kind are there?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.T%2BF=75
.
.
10T%2B5F=450
2.2T%2BF=90
.
.
Substituting from 1 into 2,
2T%2B%2875-T%29=450
T%2B75=90
Solve for T, then use either equation to solve for F.