How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside.
The man said, "Oh! I am really sorry, I thought this was my room."
He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man.
What made her suspicious of that man? He might have been genuinely mistaken.