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

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 ?

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?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Buy me, smell me or deliver me, I do not change.

Who am I?

What am I?

Usually, a boxing match consists of twelve rounds. In a particular friendly match between two heavyweights, the match was finished in the ninth round itself as one of the boxers knocked out the other one.

But, in that fight, no man threw even a single punch.

How can this be possible?

If two's company, and three's a crowd, then whats four and five ?

How many letters are in the alphabet?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?