A man dies of old age on his 25 birthday. How is this possible?

Solve below rebus puzzle?

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

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

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

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

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

Identify the next two numbers in this series.

101, 112, 131, 415, 161, 718, ???, ???