Question

A rectangular room is four times as long as it is wide, and its perimeter is 70 meters.

Find the width of the room.

Answer 1

Explanation:

length = 4×width

2×length + 2×width = 70

so, we use the first equation in the second :

2×(4×width) + 2× width = 70

8×width + 2×width = 70

10×width = 70

width = 7 meters

length = 4×width = 4×7 = 28 meters