What does this simple rebus mean?

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

What is both possible and impossible at the same time?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

In the image below, can you find the value of an angle(y)