Can you find a number that lies one third of the distance between 1/3 and 2/3?

You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

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?

I have an eye but still cannot see.

Who am I?

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

What is next number in the pattern below:

131 517 192 123 ?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

I am white when I am dirty, and black when I am clean. What am I?

A blonde put eyeliner on her head. Why?

No one wants to have it, but if one got it, he does not want to lose it. What is It?