In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

One night, a man runs away from home. He turns left and keeps running. After some time he turns left again and keeps running. Later, he turns left one more time and runs back home—but when he gets home, he finds a man in a mask. Who was the man in the mask?

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

Find the missing letter in the last circle logically in the given below picture.

Can you find out the number that should replace the question mark with a valid reason?

Can you solve the photo plexer logic ?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

How can you take 2 from 5 and leave 4?