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4c+ 2m = 142
c = 50-m
4*(50-m) + 2m = 142
200-4m+2m = 142
200-142 = 2m
58 = 2m
m = 58/2 = 29
c+m = 50
c= 50-29 = 21
(21*4) + (29*2) = 84+58 = 142
Respuesta:
coches: 21
motos: 29