My fuel is at 80% full. After traveling some distance, only 30% of that fuel is left. I fill the tank to full capacity by putting in 19 gallons. What is the full capacity of my tank?
2 Answers
25 gallons
Explanation:
First you have to find what percent of the tank is left after 30% of 80% of the fuel has been spent
multiply
now subtract
76% of the tank equals 19 gallons
set up a ratio
Now divide both sides by 76
Full tank capacity is 25 gallons
Explanation:
The only thing we are interested is the tank. Not the distance travelled.
The tank has 30% of its original content left.
Thus the amount of fuel left is 30% of 80%
Amount of the whole tank taken up by fuel is:
So the free space left in the tank by volume is
We know that it takes 19 gallons to fill up the 76% volume left.
So by ratio we have:
To change 76 into 100 we multiply it by