As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Solve the following series:
AZ, GT, MN, __, YB

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

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

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?

A father is locked up in jail. His wife has gone bankrupt. Their male child has to sell his hotel in order to gain some money. Yet their girl child does not care and is quite happy.

How can someone be so rude?