What is the next number in the series?

15 29 56 108 208 ?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

With the help clues provided in the image, can you find the 5 digit key?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Can you name an animal whose killing cannot be performed without spilling your own blood?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?