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Question

Answer

Andy has 6u marbles.
Ben has an unknown quantity B.
Scenario 1
Andy gives Ben 1/3 -> 2u
Andy has 4u remaining.
Ben has B + 2u
(B + 2u) – 4u = 20
B – 2u = 20
Scenario 2
Andy gives Ben ½ -> 3u
Andy has 3u remaining.
Ben has B + 3u
(B + 3u) – 3u = 50
B = 50
Taking (B – 2u) = 20, and B = 50,
50 – 2u = 20
2u = 30
u = 15
Andy has 6u -> 90 marbles