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2d + s = 92
s= 64-d
2d + 64-d = 92
2d-d = 92 - 64
d = 28
s = 64-d
s = 64-28
s = 36
comprobación:
2d + s = 92
(2*28) + 36 = 92
56+36 = 92
Respuesta:
hay 28 habitaciones dobles