how do I get the answer

Answer 1

For what problem?

The answer could be red, 100, H2SO4, equator, Nairobi, Einstein, 1941, etc.

Answer 2

clearly, the answer is 42.

But that does not answer your question: how do you get it?
Maybe you bounce on your head while spinning on a beach ball
Maybe you study some math.
Or maybe, just maybe, you ASK A REAL QUESTION!