Can you convert the number zero(0) into a positive number using just one mathematical operator ?

What has no start, end, or centre?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

A man was just doing his job when his suit was torn. Why did he die three minutes later?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

Who has married many women but was never married?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

What has to be broken before you can use it?

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?