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A young man meets an old man. Boasting and wanting to show off his superior qualifications, he invited:

– You and I will compare our knowledge by quizzing each other!

The old man hesitated, then added another condition:

– If you win, you get 10 dong, if you lose, you only lose 1 dong!

– Agreed, I"ll give you a quiz first.

– So who went to space first?

The old man did not answer, but quietly took out a 1-dollar bill and paid it to the young man. Okay, he continued asking:

– So who invented the law of conservation of mass?

Bear. One more sheet.

– Well, I"ve asked a lot of questions. His first question to me was not puzzle?

- Agree!

– What animal goes up the hill with 2 legs, but goes down the hill with 3 legs?

After thinking for a long time, the young man decided to take out a 10 dong bill, give it to his opponent and ask again:

- Don"t know! So what is that, sir?

The old man quietly pulled out another 1 dong bill and gave it to the young man.

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