Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Replace the question mark in the picture below.

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

What word is represented by this rebus?

A man is found hanging dead from the ceiling of a room. The room’s dimensions are 15 x 15 x 15. The man is only 6ft tall and the rope was only 2ft long. There are no windows and only one door to the room. The door is bolted shut from the inside, and a puddle of water is under the man. How did he kill himself?

what's the probability of getting a king or a queen from a pack of 52 cards?

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C