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

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

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?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Solve the equation in the image by looking at the pattern closely.

No one wants to have it, but if one got it, he does not want to lose it. What is It?

To tease, King Akbar told his most clever advisor Birbal to give his daughter one thing that she can eat when hungry, drink if she feels thirsty and can burn if she feels cold. King Akbar was shocked when Birbal gave Akbar's daughter one such thing that satisfies all of the above.

What did Birbal give to Akbar's daughter?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?