What does below Rebus mean ?

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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?

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

The following question it puts forth you:

25 - 55 + (85 + 65) = ?

Then, you are told that even though you might think it's wrong, the correct answer is actually 5!

Whats your reaction to it? How can this be true?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

A bomb exploded in a room full of married couples and no one died. How?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

What is the end of everything?