They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

10+10 and 11+11 can give you the same answer.

Explain how?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?