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

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

How Come ??

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

When can we add 2 to 11 and get 1 as the correct answer?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

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?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98