If eleven plus two equals one, what does nine plus five equal?

Which tank will fill first?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

There is a dressing drawer which contains the following coloured socks in pairs: Purple, Magenta, Crimson, White, Yellow and Turquoise. Now, the socks are paired and each pair is together in the matching set. There is no light in the room and you open the drawer and pick up a pair. Then, without noticing any colour, you keep them back and pick them up again.

Can you calculate the probability that the pair of socks was Yellow both times?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

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

What is black when you buy it, red when you use it, and gray when you throw it away?

John was driving a bus and got stuck when passing through an underpass. Then came Jacob with a needle and got the bus out of the underpass.

What did the boy do?

Find the last number in the series below:

voN luJ yaM raM ---

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.