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This problem trains for: SAT-I, AMC-8, GMAT.

Foma, Grunya and Afanasy sold chickens at the Sorochintsky Fair. They sold a total of 60 chickens. Foma and Grunya sold 20 chicken more than Afanasy. Afanasy and Grunya sold 40 more chickens than Foma. Who sold the most chickens?

(characters inspired from Gogol's "Evenings on a Farm near Dikanka")

Denote the number of chickens sold by Foma with F, by Grunya with G, and by Afanasy with A:

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Add the last two equations:

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and substitute back into the first two equations:

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Add these equations:

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Grunya sold the most chickens.