Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Outside a tattoo artist's shop, there was a signboard which read 'I make tattoos on only them who do not tattoo themselves'.

Reading it what do you think, does the tattoo artist tattoo himself?

what's the probability of getting a king or a queen from a pack of 52 cards?

I have an eye but still cannot see.

Who am I?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

I am the fastest animal but cannot climb the tree. What am I?