Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

In which direction should the missing arrow point?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

I shave every day, but my beard stays the same. What am I?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?