You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

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?

Who can jump higher than a Mountain?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

There are 3 apples in the basket and you take away 2. How many apples do you have now?

Identify the 10 differences between the two given pictures.

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

Why do we preferably have round manhole covers and not square ones?