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X = La cantidad de litros de solución que adicion
Y = La cantidad de litros de solución que obtengo
8 + X = Y (Ecuacion 1)
0.4(8) + 0.7X = 0.5Y (Ecuacion 2)
En 2:
3.2 + 0.7X = 0.5Y (Multiplico por 2)
2(3.2) + 2(0.7X) = 2(0.5Y)
6.4 + 1.4X = Y:
Y = Y:
8 + X = Y: 6.4 + 1.4X = Y
8 + X = 6.4 + 1.4X
8 - 6.4 = 1.4X - X
1.6 = 0.4X
X = 1.6/0.4
X = 4 litros
Y = 8 + X; Y = 8 + 4; Y = 12 litros
Probamos en la ecuacion 2
3.2 + 0.7(4) = 3.2 + 2.8 = 6
0.5(12) = 6
Debo usar 4 litros de solución