You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

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

What is the word or phrase below?
R | E | A | D

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Can you solve the below tricky visual equation?

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"