SOLUTION: you have 12 1/2 gallons of gas and us use 1/5 of the gas how much gas do you have left?

Question 478508: you have 12 1/2 gallons of gas and us use 1/5 of the gas how much gas do you have left?
Found 2 solutions by nerdybill, cleomenius:
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
you have 12 1/2 gallons of gas and us use 1/5 of the gas how much gas do you have left?
Begin by changing 12 1/2 gals into an improper fraction:
12 + 1/2
24/2 + 1/2
25/2
.
Next, if you've used 1/5, there is 4/5 left so:
(4/5)(25/2) = 100/10 = 10 gallons (amount of gasoline left)

Answer by cleomenius(959) (Show Source): You can put this solution on YOUR website!
12 1/2 = 25/2

25/2 * 1/5 = 25/10 = 2.5
So we have used 2.5 gallons.
12.5 - 2,5 = 10 gallons left.
Cleomenius.
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