We have 89 students. 1/2 of them eat grapes, 1/8 of them eat apples and 1/3 of them eat bananas. how many students eat pears
89 * 1/2 = 44.5 eat grapes
89 * 1/8 = 11.125 eat apples
89 * 1/3 = 29.667 eat bananas
89 - 45 -11 - 30 = 3 students eat pears