This question cannot be answered since the pieces could not have been of equal size.
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he ate two slices.
5/12 of the pizza remains.
One slice
Assume there were twelve slices. 1/4 is 3 slices, 1/3 is 4 slices. That would leave 5 slices.
You can't eat 1.2 of it. That would be eating more of it than there is. If you ate 1/2 of it, there would be 1/8 of the original pie left.