What work can one never finish?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Find the last number in the series below:

voN luJ yaM raM ---

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

Can you count the number of quadrilaterals in the picture below?

By moving just one matchstick, you need to make the below statement true. Can you do it?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Can you fill the blank with the correct number?

6 30 870 756030 _____