Feed me dry wood and air and I grow; starve me of oxygen or give me water and I die. What am I? - Answer & Hint

Feed me dry wood and air and I grow; starve me of oxygen or give me water and I die. What am I?

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Hint: It is a chemical reaction that needs fuel.

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The answer is

Fire

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Fire needs fuel and oxygen to keep burning. Water cools and smothers it, so the clue's feeding and starving language points to fire.

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Ten seconds before midnight I make a room loud; ten seconds before an exam I make it silent. Same numbers, different feeling. What am I?

Type:LogicTime

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The answer is

A countdown

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Lawyers build me, logicians test me, and one weak premise can make me collapse. What am I?

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The answer is

An argument

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What is the maximum number of pieces from 3 straight cuts across a round cake, if each cut crosses all previous cuts inside the cake?

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The answer is