Before Mount Everest was discovered, what was the highest mountain in the world?

What brings you down but never up?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

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?

What four weights can be used to balance from 1 to 30 pounds?

Can you find out the remainder when 3^300 is divided by 5?

Can you guess the name of the month by looking the below rebus ?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Jack have ten pairs of black socks, eight pairs of white socks and seven pairs of green socks. Everything is mixed in a draw. As there is no light he were not able to identify the colour of the socks. How many of the socks did he want to take to match one pair

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