7 muffins are left in the smaller box
1) Since Bob has 88 muffins and puts 9 in each box and the leftovers in the smaller box. The muffins are whole, so can't be fractioned. Then
88/9 is not divisible by 9. And 9 x 10 = 90 Then:
9 x 9 = 81
88 -81 = 7
So there are 7 muffins in the smaller box.