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If you have 7 tennis balls 1 is heavier than the others and a balance How do you find which one is the heaviest only using the balance twice?
Wiki User
∙ 15y ago
1- Take ou one ball and slit the other six into two groups of three balls
2- put the two groups in the balance ( first use ) and if they are the same weight then the ball you took out in the first place is the heavier if not and one group is heavier than the other then the heavier ball is in that group so you can exclude the other group and the ball you took out at first.
3- If one group is heavier than the other then you take one ball from that group ( it has 3 balss remember? ) and you weight the other two remaining balls ( second and last use of the balance ) if the two balls have the same weight then the ball you took out is the heavier one if not look to the balance to see which of the balls is lower and there is your answer.
Please, tell me if you understood : )
Wiki User
∙ 15y ago
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