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Weighing Bricks

Math brain teasers require computations to solve.

 

Puzzle ID:#337
Fun:*** (2.67)
Difficulty:** (1.89)
Category:Math
Submitted By:Phyllis*****!

 

 

 



A bricklayer has 9 bricks. 8 bricks weigh the same amount, but one brick is slightly heavier than the rest. The bricklayer wants to find the heavy brick. He has a balance scale. How can he find the heavy brick in only two weighings?

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Answer

He should divide the bricks into 3 groups of 3. He then weighs 2 sets of 3 bricks against each other. If they balance, the heavy brick is in the group that was set aside. If they do not balance, he then takes the group that was heaviest. He has 3 bricks left. He takes the 2 bricks from the 3 and weighs them against each other. If they balance, the heavy brick is the one which is set aside. If they do not balance, the scale will show which is the heavier brick.
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Comments

Sane**
Mar 17, 2005

I find these types of questions difficult.
AZTTT**
Sep 12, 2005

Very good. with a little trial and error, I was able to figure it out. Thanks
hidentreasure**
Dec 13, 2005

I did this one before.
tonjawithaj*us*
May 08, 2006

I NEVER get these!
flowerz2010Apk*
Jan 28, 2007

Clever
javaguru*us*
Jan 28, 2009

An oldie but goodie.

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