Name a key which is hardest to turn.

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

The current time can be represented by below textual rebus.

0
=========
B.Sc
LLB

Can you tell us the current time?

What can you see in the middle of March and April that you can never see in any other month?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

You need to remove two matchsticks to make the below equation true. Can you do it ?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

I have feet, but no legs. Which animal Am I?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.