SOLUTION: the fuel tank in my new car was 40% full. i added 28 litres and then found that it was 75% full. how much fuel does the tank hold?

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Question 947863: the fuel tank in my new car was 40% full. i added 28 litres and then found that it was 75% full. how much fuel does the tank hold?
Found 2 solutions by josgarithmetic, lwsshak3:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The 28 gallons made a difference of (75-40)% of the tank capacity.

28 gallons is 35% of the tank capacity.

28%2Fc=0.35, using c for the tank capacity.

c=28%2F%280.35%29
c=28%2A100%2F35=%287%2A4%2A100%29%2F%287%2A5%29
c=%284%2F5%29%2A100
highlight%28c=80%29

Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
the fuel tank in my new car was 40% full. i added 28 litres and then found that it was 75% full. how much fuel does the tank hold?
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let x=amt of fuel tank holds
(40%x+28)/x=75%
.40x+28=.75x
.35x=28
x=80
amt of fuel tank holds=80 litres