What's the only room from which no one can enter or leave

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

I add 5 to 9 and get 2. The answer is correct, so what am I?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

It is a 5 letter word if you take away first letter it is something you get from sun, if you remove second letter you will get something to eat, if you remove third letter you get a word you use in pointing at and if you remove the fourth letter you get something to drink. What is it?

Replace the question mark with the correct number in the below-given picture?

What is black when you buy it, red when you use it, and gray when you throw it away?

What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

Spot 5 differences in two Christmas tree below:

Chocolate costs 6 rupees and a Toy costs 5 rupees. If you have 32 rupees in total, how many chocolates and how many Toys can be purchased with that amount?