Answer
$$=8\frac{3}{4}$$
Work Step by Step
We subtract the length of the garage from the length of the truck to find how much longer the garage is than the truck. Doing this we find:
$$ 24 \frac{1}{2} - 15 \frac{3}{4}$$
In order to add or subtract fractions, we start by making a common denominator (bottom of the fraction). Then, we subtract the numerators from each other. Doing this, we find:
$$ =9+(\frac{2}{4}-\frac{3}{4}) \\ =8\frac{3}{4}$$
