Henry ate 3/8 of a pizza for lunch. For dinner, he ate 2/3 of what was left from lunch. How much of the whole pizza did he eat for dinner?

A. 3/8
B. 2/3
C. 3/4
D. 1/2
E. 5/12

First, we need to find out how much pizza Henry had left after lunch. Since he ate 3/8 of the pizza for lunch, he had 5/8 left.

Then, for dinner, Henry ate 2/3 of what was left from lunch.
2/3 * 5/8 = 10/24 = 5/12

Therefore, Henry ate 5/12 of the whole pizza for dinner. The answer is E. 5/12.