Replace the question mark with the correct number in below Picture:

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

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

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

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Count the number of balls in picture below:

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

John gave half of the apples he had plus one more to Jacob. He gave half of the remaining ones plus one more to James. Now, John was left with just one apple.

Can you find out how many did he have in the beginning?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...