If 21x = 79x, what is the value of x?

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

Why do people go to bed?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

What is the probability of choosing the correct answer at random from the options below?

a) 1/4
b) 1/2
c) 1
d) 1/4

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

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?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?