Question

Andy and Ben share some marbles. If Andy gives 1/3 of his share to Ben, Ben will have 20 more marbles than Andy. If Andy gives 1/2 of his share to Ben, Ben will have 50 more marbles than Andy. How many marbles does Andy have?

Answer 1

Explanation:

if Andy loses 1/3 or 10/30, Ben has 20 more

If Andy gives 1/2 or 15/30, Ben will have 50 more