Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?

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

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

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

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

John went to buy some expensive, foreign chocolates. He only had Rs 100 with him. When he reached the shop, he got out and know that on those chocolates, there was a 15% import duty and 5% VAT.

How much worth chocolate should he buy so that he can accommodate it in Rs 100?

What is the largest number you can write with just 3 digits?