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Lo que tiene = 140
Lo que gasto = x
Lo que no gasto = 140 - x
x = 3/4(140 - x)
4x = 3(140 - x)
4x = 420 - 3x
4x + 3x = 140
7x = 420
x = 420/7
x = 60
Gasto $ 60
Le queda 140 - 60 = 80
Gasta = 1/4 de 80
Gasta = 1/4 * 80
Gasta = 80/4
Gasta = 20
Lo que le queda = 80 - 20 = 60
Respuesta.
Le quedan $ 60