Room 15

…room number 15. Just as we entered I heard a thump and the sound of footsteps hurrying away. Somewhere a door slammed.
“At least three of us can sit down here,” said one.
There were only three possible choices.
Leaning on the sacrificial tripod I was suddenly moved to say, “Perhaps these numbers relate to each other in some specific combination…” Immediately I regretted this act of charity…sometimes I think, after all these years, that I don’t really know myself.
One of them thought he had worked it out and, very pleased with himself, led us into… Room 3 Room 30 Room 37

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