Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

Can it be possible to build a house that has all its four walls facing towards the South?

There is something which is always coming but never arrives?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

Why do Chinese men eat more rice than Japanese men do ?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

what does this below rebus represent identXQQQQQME

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Can you find out the missing number in the grid?