If it took eight men ten hours to build a wall, how long would it take four men to build it?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

Can you count the number of squares in the given picture?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

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

What's a single-digit number with no value?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

Find the missing number in the image below.

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?