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0.3 s = (0.5*0.2) a
s = 320-a
0.3*(320-a) = 0.1a
96-0.3a = 0.1a
96 = 0.1a+0.3a = 0.4 a
a = 96/0.4 = 240 soles
s = 320-a = 320-240 = 80 soles
Respuesta:
Juana tiene S/ 240
Luis tiene S/ 80