Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

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?

Remove two matchsticks to make the below equation correct.

What is harder to catch the faster you run?

Which flower has two lips?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

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

What Word am I Looking For ?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Which is heavier: a ton of bricks or a ton of feathers?