A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

Can you name four days which start with the letter 'T'?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What jumps when it walks and sits when it stands?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Give it food and it will live; give it water and it will die.