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50% = 50/100 = 0.5
20% = 20/100 = 0.2
L + J = 320
0.3*L = (0.5*0.2)*J
J = 320-L
0.3*L = (0.5*0.2)*(320-L)
0.3*L = 0.1*(320-L)
0.3*L = 32 - 0.1*L
(0.3+0.1)*L = 32
0.4*L = 32
L = 32/0.4
L = 80
Respuesta:
Luis tiene S/ 80