# Pool riddle; literally

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#### fti

##### Guest
Blud's informative post on the smallest pool ball reminded me of a riddle involving pool balls.

8 pool balls. One ball is either heavier or lighter. On a balancing scale you get 3 tries to find the ball that is either heavier or lighter. How should you measure so that by the third try you can find the ball that is either heavier or lighter?

#### fxskater

##### Ryan The Salmon Arm Lynn
Silver Member
Easy, weigh 4 against 4 whichever end goes lower those balls are eliminated, then measure 2 against 2 whichever end goes lower is eliminated then measure 1 against 1 you have your lighter ball. This is like an IQ test question.

#### bruin70

##### don't wannabe M0DERATOR
Silver Member
fxskater said:
Easy, weigh 4 against 4 whichever end goes lower those balls are eliminated, then measure 2 against 2 whichever end goes lower is eliminated then measure 1 against 1 you have your lighter ball. This is like an IQ test question.

if you knew that the ball you were looking for either heavier or lighter, your solution would work. but what if you DIDN'T know whether the ball you're looking for is heavier or lighter. in which case the ball you're looking for could still be in either group of four.

or maybe i didn't understand the riddle correctly.

Silver Member