What brings you down but never up?

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

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

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

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

I have an apple tree , number of apple in this tree get doubles every week.

On 30th week , the tree gets completely filled with apples :-)



Can you tell me , on what week does my tree is half covered with apples ?

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

Where do fish keep their money?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?