using four eights (8) and a one (1) and one mathematical symbol , create the number 100

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Why are all black people so quick ?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

I can write cow in 13 letters.

Can You?