Question

At a speed of 50 miles per hour, a certain car uses 1 gallon of gasoline every 30 miles. if the car starts with a full 12 gallon tank of gasoline and travels for 5 hours at 50 miles per hour, the amount of gasoline used would be what fraction

Answer 1

1 gallon = 30 miles

5 hours = 250 miles

`250 / 30 = 8 (1)/(3)`
Fraction of amount of gasoline used =

`( (25)/(3) )/(12) \\ = (25)/(3) * (1)/(12) \\ = (25)/(36)`
Answer is 25/36

Hope this helps. - M