80 foot roll of fence. to fit in backyard the width must be 15 feet long. how long can he make the other side in feet if he wants to use the entire roll?

65 feet.

Step-by-step explanation:

80 feet roll of the fence is there.

It fits in the backyard the width must be 15 feet long.

So, there will be remaining (80 - 15) = 65 feet of fence.

If he wants to use the entire roll to fence the other side of the area then he can do it for more 65 feet length. (Answer)