Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

What time is it when an elephant sits on a fence?

A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

Who is that with a neck and no head, two arms and no hands? What is it?

What does below pictogram mean?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

Keyboard words are not in alphabetical order, Why?