A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Buy me, smell me or deliver me, I do not change.

Who am I?

How do you go from 98 to 720 using just one letter?

Which flower has two lips?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?