Remove two matchsticks to make the below equation correct.

How can you leave a room with two legs and return with six legs?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

Count the Triangle in the figure given below:

Make a sentence consisting of three words that have the whole alphabet.

Take one out and scratch my head, I am now black but once was red. What am I?

What does this mathematical rebus means ?