If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

Solve the counting riddle by identifying the number of triangles in the given picture.

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

If Japan and Panama decided to merge into a single country, probably people will name it Japanama.

Can you think of two more such country's unions that could produce similar names like Japanama by overlapping their three letters?

Can you fill the blank with the correct number?

6 30 870 756030 _____

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?

What does the below rebus riddle means?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?