You wanna know how many slices of pizza's were sold so all you really have to do is divide 38 1/8 ( mixed number ) with 8 ( a whole number )
38 1/8 divided by 8 = 4 49/64
so now you have to simplify it so 4 49/64 simplified is
1 3/4 ( as a mixed number ) simplify 4 49/64 as a improper fraction is 7/4
Hope I helped! ( Smiles )