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motos = y numeros de llantas = 2x
ademas
x+y = 40
x =40-y-----------------------------1
también
4x+2y = 94 -------------------2
1 reemplazando en 2
4(40 - y) + 2y = 94
160-4y +2y = 94
-2y = 94-190
-2y = -66
y = -66/-2
y = 33 motos
carros = 40-33 = 7 carros
veamos comprobación
7*4+33*2 = 94
28+66 = 94
94= 94