I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

What number should come in place of the question mark below?

Solve the counting riddle by identifying the number of triangles in the given picture.

They are three errirs in this question. Can you find them?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?