Math and Arithmetic
Algebra

Out of 9 balls 8 balls weight the same 1 is lighter. using scales twice which ball is lighter?

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2008-08-28 00:47:33

Set three balls aside. Divide the remaining 6 balls into 2

groups of 3 and weigh them. If the groups weigh the same,

the lightest ball must be in the group you set aside. Otherwise,

the lightest ball is in the group that weighed less. Take the group

of thee that remains and set aside one ball. Weigh the other

two. If the two balls weigh the same, the lightest ball must be the

one you set aside. Otherwise, the lightest ball is the one that

weighed less.


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