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

In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents the same.Can you place 8 queens on the board in a manner that none of the queens can attack each other?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Where do you go to learn how to make ice cream?

Count the number of triangles in the below picture?

What am I?

Which tank will fill first?

Name a key which is hardest to turn.

You bought me for dinner but never eat me. What am I?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?