Replace the question mark with the correct number in below Picture:

A blonde put eyeliner on her head. Why?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

What has many teeth, but cannot bite?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

What is the centre of gravity?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Solve the puzzle by telling what does below picture means.

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?