# A contractor is pouring a concrete driveway. The perimeter is 108 ft. What length will the driveway be if the width is 12. How long is the driveway?

Jan 6, 2017

The length of the driveway is $42 f t$.

#### Explanation:

Since the driveway is rectangular, the perimeter will be calculated as twice the sum of its length and width. Hence:

$p = 2 \left(l + w\right)$

Since we know $p$ and $w$, we substitute the values and calculate the length.

$p = 2 \left(l + w\right)$

$108 = 2 \left(l + 12\right)$

Divide both sides by $2$.

$54 = l + 12$

Subtract $12$ from both sides.

$42 = l$