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?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What does this rebus riddle means ?

In a university, a professor gave a set of three problems to the three brilliant students of his class. See the image for the questions.

Can anyone tell me a word in the English dictionary which has a silent 'z'?

Solve the counting riddle by identifying the number of triangles in the given picture.

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

Which is heavier: a ton of bricks or a ton of feathers?