What is the fastest way to double your money?

Can you count the number of lines in the below picture?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

Why do you find that most of the buildings are deprived of the 13th floor?

What part of the chicken has the most feathers?

Write the next letter in this sequence.
O, T, T, F, F, S, S, E, __
**Hint: It is a Number Series Puzzle

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

We can be boring,Or interesting.
We can be long,Or short.
We can have pictures,Or just words.
Many love us,But many also hate us.
What are we?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Which city is three-fifths chick two third cat and 50% goat?