the total grapes is a whole, that is 100% or simply put 1, all the fractions must add to 1 to get the total. So we have: akeem: 1/2 jamila: 1/3 kim: x 1/2 + 1/3 + x = 1 3/6 + 2/6 + x = 1 5/6 + x = 1 x = 1 - 5/6 x = 6/6 - 5/6 x = 1/6 so kim has 1/6 still