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

Who am I?

Can you start the fire using two pieces of wood?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

How many bananas can you eat if your stomach is empty?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

If 2 workers can complete painting 2 walls in exactly 2 hours.

How many workers would be needed to paint 18 walls in 6 hours?

Different lights make me strange by changing me into different sizes. What am I?

Can you solve below mathematical equation?

2^1234 - 2^1233

Considering the below equation:

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

Then, I + II + III = ?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?