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

In the image below, can you find the value of an angle(y)

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Spot 5 differences in two Christmas tree below:

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

What is the next number in this matchsticks series riddle?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

No matter how little or how much you use me, you change me every month. What am I?

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?