What is the next number in the series?

15 29 56 108 208 ?

I am white when I am dirty, and black when I am clean. What am I?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

Can you start the fire using two pieces of wood?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

What is at the end of a rainbow?

Tell me the Hindi name of a Vegetable which if we remove 1st word will become a precious Stone and by removing the last word it will become a sweet eatable.

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

What is the last thing you take off before bed?