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

What has no start, end, or centre?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

There are 3 apples in the basket and you take away 2. How many apples do you have now?

What does man love more than life, and hate more than death or mortal strife; that which satisfied men want; the poor have, and the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

What's the only room from which no one can enter or leave

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

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

You see me once in June, twice in November, and not at all in May. What am I?