This is a division problem.
Divide 2 3/5 by 1/8.
First, write 2 3/5 as an improper fraction.
Then divide the fractions.
(2 3/5) / (1/8) =
= (13/5) / (1/8)
= 13/5 * 8/1
= 104/5
= 20 4/5
There were 20 1/8-inch thick slices and one thinner slice at the end.