John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

In the image given, you can find several triangles. Can you count them all?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

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.

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?