John had 2/3 of his homework done sarah had 5/10 alex 7/8 and michelle 1/2 who complete most of the homework

It would be Alex. John finished 66.6 percent of his homework, Sarah completed 50 percent, and Michelle completed 50 percent of her homework. While Alex has completed 87.5 percent of his homework.

Alex has completed most of his homework. this is because sarah and michelle had only done half so then u r left with alex and john, 2/3 is smaller than 7/8 if u make them equivalent

Where is the problems

Using the rise/run rule. you would get 2/6.simp. 1/3