When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

In a mathematical quiz, you are asked the following question:

Use three 9s in a mathematical expression without dividing or multiplying to form the number one.

Can you answer the question?

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

Why do Chinese men eat more rice than Japanese men do ?

How many times can you subtract the number 5 from 25?

Can you place six X (crosses) in below board without making three in a row in any way ?

Can you quickly find which two matchstick figures are identical?

During which month do people sleep the least?

Andrew sees a very rare bird named "Ruppell's vulture". Soon Andrew was dead. Can you explain the mystery, Mr. Sherlock?

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?