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?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Which English verb becomes past tense just by rearranging the letters?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

What is the probability of choosing the correct answer at random from the options below?

a) 1/4
b) 1/2
c) 1
d) 1/4

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

I have branches, but no fruit, trunk or leaves. What am I?

Remove two matchsticks to make the below equation correct.