5 slices are left. 8\8 - 3\8 equals 5\8.
The whole pie is about 8 slices. 3/8 of it are served so 5/8 is left
After serving 3 out of 8 slices of pie, 5 slices are left. This can be expressed as 8 5 of the whole pie remaining. Therefore, the amount of pie left is 8 5 .
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