What is the fastest way to double your money?

They are three errirs in this question. Can you find them?

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

A Shopkeeper collects 71 rupees in the form of 20 paisa and 25 paisa.
He collects a total of 324 coins.

Can you tell me how many number of 20-paisa and 25-paisa he got?

What is the word or phrase below?
R | E | A | D

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

Can you count the number of lines in the below picture?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?