Answer:
Ananth
Step-by-step explanation:
Ananth: 20x - 7x = 13x cards gained
Bala: 17x - 6x = 11x cards gained
Chandana: 15x - 5x = 10x cards gained
Dev: 14x - 4x = 10x cards gained
Ananth gained 13x, which is more than everyone else
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