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

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?

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?

Solve the riddle below:

If a Chicken says, 'All chickens are liars" is the chicken telling the truth?

What kind of tree can you carry in your hand?

Find the next number in the series

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

What has a bottom at the top?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?