Why is a river so rich ?

Using Only Five 5's and any mathematical operator make sum as 37

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

Client Dempsey living in one of the East Coast states of the U.S. was talking to Landon Donovan, who was living in the West Coast state of the U.S.

Dempsey: What time is it?
Donovan: Wow, It is the same time here.

How is this possible?

How many triangles are there on the puzzle below?

Can you write down eight eights so that they add up to one thousand?

The more you take me, the more you leave me behind.
Who Am I?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____

You need to arrange three 7 and mathematical symbols to form number 1?