SOLUTION: There are 9 golf balls in total. One of the others and you need to figure out which one is it. You can only use the scale twice. How do you figure which golf ball is the heavy on

Algebra ->  Test -> SOLUTION: There are 9 golf balls in total. One of the others and you need to figure out which one is it. You can only use the scale twice. How do you figure which golf ball is the heavy on      Log On


   

Question 39785: There are 9 golf balls in total. One of the others and you need to figure out which one is it.
You can only use the scale twice.
How do you figure which golf ball is the heavy one.
I REALLY NEED HELP ONTHIS QUESTION, I WILL GET BONUS MARKS FOR THIS QUESTION ON THE TEST.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Make three groups of three.
Put two of the groups on opposing scales.
IF THE TWO GROUPS BALANCE: the heavy ball is not in those two groups.
So take the remaining group; put one ball on each scale.
If they balance the heavy one is in your hand; if one
side is heavier, it is the heavy ball.
IF THE TWO GROUPS DO NOT BALANCE: the heavier ball is in the heavier
group. Follow the procedure outlined above for the heavier of the
two groups of three.
Cheers,
Stan H.