Can you place three balls such that the equation shown in the picture holds true?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

Find the missing letter in the last circle logically in the given below picture.

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

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

What is the next number in this series?

4,12,84,3612....

Count the number of lines in the image below ?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

what's the probability of getting a king or a queen from a pack of 52 cards?