If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

Which part of London exists in France as well ?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Remove two matchsticks to make the below equation correct.

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

What has 13 hearts but no other organs?

Can you count the number of matches in the picture below ?

Why is it very easy to weigh a fish?