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s + t = 120
s/t = 3
Despejo s en 1
s = 3t
Sustituyo s en 2
s + t = 120
3t + t = 120
4t = 120
t = 120/4
t = 30
Sustituyo el valor de t en el despeje de s
s = 3t
s = 3 (30)
s = 90
Los números que buscas son: 30 y 90