Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Can you find out the number that should replace the question mark with a valid reason?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

Four cars come to a four-way stop, each coming from a different direction. They can’t decide who got there first, so they all go forward at the same time. All 4 cars go, but none crash into each other. How is this possible?

O_er_t_o_

Complete the missing letters of the given word.

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

Find the missing letter in the last circle logically in the given below picture.

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

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?