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Alicia : x
Ana gasta : 3x.
Sumammos.
2x + x + 3x = 72
6x = 72
x = 72/6
x = 12
Ahora solo reemplazamos el valor de x.
Juan = 2x ====> 2(12) = $24 soles ah gastado.
Alicia = x ====> $12 ah gastado.
Ana = 3x ====> 3(12) = $36 ah gastado.