Can you find the key in the picture below?

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member.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

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

How can a man go eight days without sleep?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?