SOLUTION: Siti saved $4.40. She saved 50-cent and 10-cent coins only. She has twice as many 50-cent as 10-cent coins. How many 50-cent coins does she have?

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Question 988232: Siti saved $4.40. She saved 50-cent and 10-cent coins only. She has twice as many 50-cent as 10-cent coins. How many 50-cent coins does she have?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
F - number of 50 cent coins
T - number of 10 cent coins
.
.
.
50F%2B10T=440
F=2T
.
.
.
Substituting,
50%282T%29%2B10T=440
100T%2B10T=440
110T=440
T=4
So then,
F=2%284%29
F=8