How can a man go eight days without sleep?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

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?

What can you deduce from the following BrainBat?

CRY
LMKI

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?

What's the only room from which no one can enter or leave

Which digit occurred maximum times between the number 1 and 1000?

what does this picture(rebus) riddle means ?

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

Which word does the below Plexor means ?