An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

Can you solve the below geography rebus by decoding the below rebus ?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What breaks yet never falls, and what falls yet never breaks?

I am dry when I go inside, but wet when I am pulled outside.
The longer I am inside, the stronger I get
When I am completely out, I am wet and I literally sag
Who am I?

Can you count the number of lines in the below picture?

Before Mount Everest was discovered, what was the highest mountain in the world?

At a party, there are five people and a whole round cake lying at the centre of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?