Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

There is something which is always coming but never arrives?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

What does Alexander the Great and Winnie the Pooh have in common?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

Can you fill the blank with the correct number?

6 30 870 756030 _____

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

In a classic wine shop, the list of three most popular wines are:
- The cost of 1 French wine bottle: 500$
- The cost of 1 German wine bottle: 100$
- The cost of 20 Dutch wine bottles: 100$

John entered the wine shop and he needs to buy
- All three types of wine bottles.
- Needs to buy Dutch wine bottles in multiples of 20.
- Need to buy 100 wine bottles in total.

John has only 10000$. How many wine bottles of each type, John must buy?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?