I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

In the image given, you can find several triangles. Can you count them all?

Find the missing number in the series below

13 -21 34 -55 ? -144

What is black when you buy it, red when you use it, and gray when you throw it away?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

What 5-letter word typed in all capital letters can be read the same upside down?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

We know that money can be names differently for the purpose it is used for. Some of the examples of money given at following places or for following activities:

In temple = Daan
In school = Fees
During marriage = Dowry
For divorce = Alimony
Paying government = Tax
In court = Fine
Employer to employee = Salary
To kidnappers = Ransom
For illegal reason = Bribe
To civil servant retirees = Pension

Do you know what do we call the money a husband gives to his wife?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.