You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

Why do we preferably have round manhole covers and not square ones?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Jack have ten pairs of black socks, eight pairs of white socks and seven pairs of green socks. Everything is mixed in a draw. As there is no light he were not able to identify the colour of the socks. How many of the socks did he want to take to match one pair

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

What's a single-digit number with no value?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.