Which tank will fill first?

During an interview, the interviewer ordered hot coffee for the candidate to relieve the stress. The coffee was kept before him. After a minute, the interviewer asked him, 'What is before you?' He replied 'Tea'.

The candidate was selected immediately. Why?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Can you find the missing piece of the Porsche?

What can you hold in your right hand, but never in your left hand?

In a family supper, a grandfather, a grandmother, two fathers, two mothers, four children, three grandchildren, one brother, two sisters, two sons, two daughters, one daughter-in-law, and one mother-in-law need to sit at a table.

There are only seven chairs available at the place. How many more chairs do they have to borrow so that everyone can sit down together for the suppers if everybody requires a separate chair?

There is a place where if I stand up straight, I will still be considered sideways.

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?