When 99 is considered higher than 100?

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 ?

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

Can you find the missing piece of the Porsche?

Can you replace the question mark with the correct number in the below table sequence?

Why is the Hole below a Lock?

During which month do people sleep the least?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?