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N = menos
Establecemos la proporción
M/N = 7/4
Aplicando propíedades de proporciones
(M - N)/N = (7 - 4)/4
120/N = 3/4
3N = 120x4
3N = 480 N = 160
M/160 = 7/4
M = 160x7/4 M = 280
El vehículo menos pesado pesa 160 kg