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

A generous owner of a company decided to give a bonus of $45 to every man and $60 to every woman on his birthday. But only one-ninth of the men and one-twelfth of the women were present to take the bonus.

Can you calculate the amount of money the owner spent if there were 3552 employees?

What number divided by 4 is the same as that number minus 4?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

Solve the mathematical equation in the picture below.

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

Can you find out the remainder when 3^300 is divided by 5?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

What does this mathematical rebus means ?