Find one heavier ball out of 8 exactly same looking balls using a scale.

Question

Sigiloso · Accepted Answer

do 3, 3 first. if wieght is diff then one of two left out. => twice usage of scale.
if one side is heavier the other from 3,3 then other three and 2 left out are same.
then put 1,1 and leave one out. => twice usage of scale.

ronnie · Answer

break the 8 balls into 4 groups of 2 each - weigh each group and pick the heaviest out of each - 4 weighings, then take the 4 heavy balls and break it into 2 groups .... weigh each group like before - 2 weighings, then take the 2 last balls and weigh to get the heaviest ball .... so in all 7 weighings

Sam · Answer

Well, why not take 4 and 4, weight it and pick the heavier scale, then break the 4 into 2 groups then take the heavier one, then break the 2 balls into 1 and 1 and you will get the heavier ball... the heavier ball is picked out.

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