I think that each shelf will be 19 inches. Because 137 divided by 7 is 19 with the remainder of 4. Half of 4 is 2. Take 2 inches off of each end and that is the 4. So each shelf is 19 inches.
We have been given that Michelle has a plank 137 inches long that she wants to cut into 7 shelves of equal length. The plank has jagged ends, so she will start by cutting 2 inches off each end.
Since she cute 2 inches from each end, so she will cut 2*2 inches or 4 inches from both ends.
The length of plank left after cutting off jagged ends would be .
Now, we will divide 133 by 7 to find length of each shelf.
Therefore, the length of each shelf would be 19 inches.
