What is the next number in this matchsticks series riddle?

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?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

Can you tell a 3D object that has just two surfaces?

Forwards I am heavy, backward I am not. What am I?

Can you identify the Oscar-winning movie from the rebus below?

how come the second man dies?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Which is faster, Heat or Cold ? Explain.

The centre of the third figure is empty. What digit should fit inside?