How many triangles can you find in this given picture?

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

Consider this about a word: The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

Can you find the missing piece of the Porsche?

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Solve the puzzle by telling what does below picture means.