Can you find out which number multiplied by itself will give the output as 12345678987654321?

How many times can you subtract the number two from the number fifty?

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 ?

Why is Saturday stronger than Monday?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Find the value of "?" in the ball picture Riddle below:

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

There is a square piece of paper with a hole that is denoted by the circle on the top right side in the given picture. You have to cut the paper in a manner that it forms two and only two separate pieces of paper and then rearrange the pieces in a manner that the holes come in the centre of the paper.