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23 (2 thirds)
To find out how much of the whole pizza Henry ate for dinner, we first need to calculate how much pizza was left after he ate 3/8 for lunch.
If he ate 3/8 for lunch, then 5/8 of the pizza was left.
Then he ate 2/3 of what was left from lunch for dinner.
2/3 of 5/8 is (2/3) * (5/8) = 10/24 = 5/12.
This means that for dinner, Henry ate 5/12 of the whole pizza.