There are seven sisters in a house in a village where there is no electricity or any gadget.

Sister-1: Reading Novel
Sister-2: Cooking
Sister-3: Playing Chess
Sister-4: Playing Sudoku
Sister-5: Washing clothes
Sister-6: Gardening

what is Sister-7 doing ?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

You need to move three matchsticks to form three squares. Can you do it?

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

What's a single-digit number with no value?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

What has a bottom at the top?

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.

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

why number 8549176320 is one of a kind?