In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

A father's child, a mother's child, yet no one's son.

Who am I?

What is the next number in this matchsticks series riddle?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Which tank will fill first?

A man is lying dead in a field where no one is around. His head is split open and his legs are disfigured. Near to him, there is an unopened package. No living organism can be found anywhere at the crime scene.

How did he die?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?