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

A man had five children. He had $100 with him to give to his children. He decided to start with the youngest child and then give $2 more than each younger child to his next elder child.

For example, if he gives $x to the youngest child, he will give $(x+2) to the next one, $[(x+2) + 2] to the next one and so on.

Can you find out how much did the youngest one receive?

I am an odd number. Take away a letter and I become even. What number am I?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Our product and our sum always give the same answer. Who are we?

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

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

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?

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable