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Numero menor = x
Numero mayor = 100 - x
3x - (100 - x) = 20
3x - 100 + x = 20
4x - 100 = 20
4x = 20 + 100
4x = 120
x = 120/4
x = 30
El numero menor = x = 30
El numero mayor = 100 - x = 100 - 30 = 70
Respuesta.
Los numeros son 30 y 70