Jessica is telling her friends this story and asks them to guess if it’s the truth or a lie: “There was a man sitting in a house at night that had no lights on at all. There was no lamp, no candle, and no other source of light. Yet, he sat in the house and read his book happily.” Her friends say she’s lying, but Jessica corrects them and says she’s telling the truth. Jessica’s story is true—but how?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Can you complete the sequence?

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

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

What part of the chicken has the most feathers?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?