Alvin had some marbles in a box. he kept 1/3 of them and gave the remainder to joyce and sean. joyce got 5/8 of the remainder. what fraction of the parables did sean get?

First, Alvin gave Joyce and Sean 2/3 of the remainder, to solve first find the common denominator, which in this case is 24. Then, 1/3=?/24, 24/3=8 so it is 8/24 for the total given by Alvin. Joyce got 5/8, 5/8=?/24, 24/8=3,3 x 5=15, 15/24.
15/24 - 8/24=  7/24 is the answer