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

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

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

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

Why Aeroplane windows are round?

What is the longest word in the dictionary?

How many Watermelons are there in the below picture?

You are playing a game with your friend Jack. There are digits from 1 to 9. You both will take turn erasing one digit and adding it to your score. The first one to score 15 points will win the game.

Would you want to play first or second?

PS: The sum should be exactly 15.

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Tell me the Hindi name of a Vegetable which if we remove 1st word will become a precious Stone and by removing the last word it will become a sweet eatable.