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0.5a = 0.75b
a = b*(0.75/0.5)
a = 1.5b
1.5b + b = 1000
2.5b = 1000
b = 1000/2.5
b = 400
a+b = 1000
a+400 = 1000
a = 1000-400
a = 600
Respuesta:
$600