A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

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 four images below, can you find the odd one out?

What always comes into a house through the keyhole?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

I know a nine-letter word having only one vowel.
Do you ?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

What word is represented by this rebus?

What breaks yet never falls, and what falls yet never breaks?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?