What four weights can be used to balance from 1 to 30 pounds?

Replace the question mark with the number below given a simple math problem.

Can you solve the below rebus?

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 ?

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

What does Alexander the Great and Winnie the Pooh have in common?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

81 x 9 = 801. What must you do to make the this equation true?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.