Question

If a 5000 pound car gets only 12 miles per gallon, what will be fuel efficiency in miles per gallon of 2000 pound car?

Answer 1

Since $\frac{5000}{2000} = \frac{5}{2}$, multiplying 12 by $\frac{5}{2}$ should give you your answer.
$12* \frac{5}{2} = 30$