Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

What is more useful when it is broken?

Can you name an animal whose killing cannot be performed without spilling your own blood?

If 21x = 79x, what is the value of x?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

Jessica is telling her friends this story and asks them to guess if it’s the truth or a lie: “There was a man sitting in a house at night that had no lights on at all. There was no lamp, no candle, and no other source of light. Yet, he sat in the house and read his book happily.” Her friends say she’s lying, but Jessica corrects them and says she’s telling the truth. Jessica’s story is true—but how?

People put me on the table and cut me but do not eat me. What am I?

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

To attend world science seminar, A famous chemist from Mexico visit
London. In the lab, the scientist was killed and his six assistants were under suspicion of killing the chemist.
Name of six assistants: Austin, Wayne, Dege, Oscaru, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

A local detective Jack was called to solve the case,

After reading the note, Jack instantly asked the police to arrest the murderers.

Who are the murderers?