What is both possible and impossible at the same time?

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?

In the Thar desert, 3 men found a big 24L Jar is full of water. Since there is a shortage of water so they decided to distribute the water among themselves such that they all have equal amounts of it. But they only have a 13L, a 5L and an 11-litre Jar.

How do they do it?

Can you find the missing piece of the Porsche?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

Make a sentence consisting of three words that have the whole alphabet.

By using 'because' continuously three times, can you make an English statement ?

Paul's height is six feet, he's an assistant at a butcher's shop and wears size 9 shoes. What does he weigh?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?