John Gill Commentary Judges 14:13

"but if ye cannot declare it unto me, then shall ye give me thirty linen garments and thirty changes of raiment. And they said unto him, Put forth thy riddle, that we may hear it." — Judges 14:13 (ASV)

But if you cannot declare it to me
Explain the riddle in the space of time allowed:

then shall you give me thirty sheets, and thirty change of garments ;
so many shirts and suits of apparel:

and they said to him, put forth your riddle that we may hear it ;
not thereby to judge whether they would agree to his proposals, but hereby suggesting that they accepted his terms and conditions, either to give or receive the above premium, if they did or did not hit on the explanation of the riddle.