What number comes next in the sequence (and why)?
20, 3, 5, 12, 15, 4, 30, ?
Fair warning: I don't know the answer. This question was on a test I took as part of a job application 4 years ago and it was the only one I couldn't solve. After the test, I posed the question to my Facebook friends and they were predictably useless. This morning, Facebook's "past posts" feature threw this shame in my face once again, so I'm hoping one of you can figure it out.
The test it came from was all math, mostly word problems and number sequences. I would describe the test as notably harder than the typical standardized exams used for entry into American universities, but not overwhelmingly so. It was roughly akin to the latter portion of a Wonderlic Test, if that's any help as a reference. The point is: I don't expect that the numbers are cryptic references to Bible verses or dead presidents. I think it's just a math sequence, and I'm fully prepared to feel foolish upon learning of the solution. Hopefully one of you can make me that fool?
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