Replace the question mark with the correct number below.

Count the Triangle in the figure given below:

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

81 x 9 = 801. What must you do to make the this equation true?

I cannot talk, but I always reply when spoken to. What am I?

Which fur should we be getting from the Lion?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

How many times do a clock's hands overlap in a day ?

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?