When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

Can you make the number 24 by utilizing the numbers 1, 3, 4 and 6? You must use one number only one time and you can use mathematical operation symbols anytime anywhere.

Count the number of triangles in the picture below:

Can it be possible to build a house that has all its four walls facing towards the South?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?