A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

A father's child, a mother's child, yet no one's son.

Who am I?

While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Identify the movie name through below Rebus containing Pi Mouse and coconut tree..

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

How many triangles can you find in this given picture?

Find the number of squares in the below picture