I have feet, but no legs. Which animal Am I?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

Different lights make me strange by changing me into different sizes. What am I?

Can you decipher the following common phrase?

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

Two friends Smith and Andrew were talking about the bravery of their families. Smith told great stories about his courageous grandfather who fought for Britain in "World War I". Andrew told that his grandfather was so brave that in 1919 just after the war he was honoured with a bravery medal with the words "For our Courageous Soldiers In World War I" embedded into it. Smith knows that his friend is lying. How?

If eleven plus two equals one, what does nine plus five equal?

A pack of cards has 40 cards. You are blindfolded. Out of 40, 25 cards are facing down while 15 are facing up. You have been asked to divide this pack of cards into two decks - so that each deck contains an equal number of face-up cards. Remember, you are blindfolded.

How will you do it?

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

What question can you never answer yes to?