A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

Which number comes next in the number series?

2, 9, 30, 93, ?

Count the number of lines in the image below ?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

Can you complete the sequence?

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

Identify the 10 differences between the two given pictures.

Can you find the 09 errors in the picture below?

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

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