Answer:
The brother ate 1/6
Explanation:
3/4 = 9/12
The whole pizza is 12/12
12/12 - 9/12 = 3/12
3/12 is what is left
The broter ate 2/3 of this leftover
3/12 = 1/12 +1/12 + 1/12
the brother ate 2/12 = 1/6
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