What Adam and Eve do not have but the rest of the people have?

What do you call a fish without an eye?

What always comes into a house through the keyhole?

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

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

By moving just one matchstick, you need to make the below statement true. Can you do it?

Can you solve this picture maths equation?

An explorer goes on an exposition in the jungle. He sets up camp in the middle of the jungle. The next morning he sees something with a head and a tail, but he is not afraid. What did he see in his bag?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?