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Jose
X(4/5) = 4X/5
Quedan: X - 4X/5 = 1X/5 = X/5
Antonio
Ahora (4/7) de (X/5)
(X/5)(4/7) = 4X/35
Antonio come 4X/35
Quedan: X/5 - 4X/35 = 7X/35 - 4X/35 = 3X/35
3X/35 = 30 gramos
3X = (30)(35)
3X = 1050
X = 350 gramos
La tarta pesaba 350 gramos
Jose: (4x350)/5 = 280 gramos
Antonio: (4x350)/35 = 40 gramos
280 + 40 + 30 = 350 gramos