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

What has many teeth, but cannot bite?

If,

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

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

D + F = ?

Mr Black, Mr Gray, and Mr White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr Black, who hits his shot 1/3 of the time, gets to shoot first. Mr Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr Black, where should you shoot first for the highest chance of survival?

In The Image Below Which clock is the odd one out?

Can you count the number of triangles inside a triangle?

Can you find out the number that should replace the question mark with a valid reason?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

What does this rebus riddle mean?