A carpenter has a plank 8 1/2 feet long.

How many feet should be cut off to make a plank 5 7/8 feet long?

3 4/8 or 3 1/2

Step-by-step explanation:

First thing you would have to do is making, 8 1/2, the denominator 8. so what is 4 x 2? 8. So then you would have to multiply the 1 by 4 and you would get 8 4/8. Subtract 8 1/2 and 5 7/8 and you get 3 4/8. Simplify and you would get 3 1/2