Can you find a five letter word that is left with only two letters if one is removed?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?

Count the squares in the matchstick puzzle below?

Can you count the number of squares in the given picture?

Which flower has two lips?

How can a man go eight days without sleep?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?