Answer: Enzo uses 5/16 of the original block of clay to make his bowl.
Explanation:
Enzo first cuts 1/4 of the block of clay to make a bowl. Therefore, he has 3/4 of the original block remaining.
Then he uses 1/6 of this remaining piece to make the bowl.
So, the amount of clay used to make the bowl is:
(1/4) * (3/4) + (1/6) * (3/4)
= (3/16) + (1/8)
= (6/32) + (4/32)
= 10/32
= 5/16
Therefore, Enzo uses 5/16 of the original block of clay to make his bowl.