A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

In a mathematical quiz, you are asked the following question:

Use three 9s in a mathematical expression without dividing or multiplying to form the number one.

Can you answer the question?

Find the next number in the following series:
6, 14, 26, 98, __?

How many triangles are there on the puzzle below?

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

Which part of London exists in France as well ?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?