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

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

What type of tree can I carry in my hand?

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

It is always ahead of me yet I can never see it. What is it?

What is the fastest way to double your money?