Three wise men could not solve, who from them the wisest. The casual passer-by has helped(assisted) them. It(he) has got from a bag five caps, three white and two black, and has told, that the wise will declare(announce) the one who the first will guess, what color on it(him) a cap. Then has planted(put) debaters against each other, has fastened it(him) eyes, the plot on a cap and has allowed to remove(take off) bandages.

Long the wise men, at last one of them thought has exclaimed:

« On me a white cap! »

Why it(he) so has solved?