riddle

a game in which the players must discover the answer to a difficult question

can find it out

This means to figure out the meaning of the riddle. AT: "can figure out its meaning" (See: rc://en/ta/man/translate/figs-idiom)

"30 linen robes and 30 sets of clothes" (See: rc://en/ta/man/translate/translate-numbers)

Here the word "you" is plural and refers to the guests at the feast. (See: rc://en/ta/man/translate/figs-you)

a type of cloth