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?

I travel all around the world but always stay in the corner. What am I?

A man dies of old age on his 25 birthday. How is this possible?

What is more useful when it is broken?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

What do you call a fish without an eye?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Which of the below owl is odd one out?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Find the smallest sentence with all the English alphabet.