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

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

What is both possible and impossible at the same time?

Which city is three-fifths chick two third cat and 50% goat?

What kind of band never plays music?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

Can you divide the below-given shape into four equal and identical pieces?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

What month of the year has 28 days?