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

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

A man dies of old age on his 25 birthday. How is this possible?

You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

O_er_t_o_

Complete the missing letters of the given word.

I have an eye but still cannot see.

Who am I?