What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

I look at you, you look at me I raise my right, you raise your left. What am I?

Complete the table series riddle by finding the number that can replace "??".

What can go up a chimney down, but can’t go down a chimney up?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?