Replace the question mark with the correct number in the below-given picture?

Solve the equation in the image by looking at the pattern closely.

What is the fastest way to double your money?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

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

John buys rice at Rs.60/kg from Britain and then sells them at Rs.5/kg in India. As a result of this, he becomes a millionaire. How come?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

Which alphabet letter is a question?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

What happened when the wheel was invented?