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n° de edad = y
x+y = 100 (+)
(-1) x - 4y = 30
---------------
y+4y = 70
5y = 70
y = 70/5
y = 14 (Edad de Maria)
∴ x+y= 100
x+14 = 100
x = 100-14
x = 86 (Número de Casa) → Respuesta