Prove that twice of ten is the same as twice of eleven.

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

What does this rebus riddle means ?

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?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Solve the puzzle by telling what does below picture means.

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

Can you find the hidden animal in the picture below?

What has to be broken before you can use it?

If Rajina's daughter is my daughter's mom, who am I to Rajina?