1 Ball is heavier of of 8 balls, can you find which one?
You have 8 balls all of the same size. 7 of them weigh the same, and one of them weighs slightly more.
How can you find the ball that is heavier by using a balance and only two weighings?
Expert Asked on 24th August 2015 in Interview Puzzles.
Divide the balls into the following groups: (1,2,3),(4,5,6),(7,8)
Weigh (1,2,3) against (4,5,6)
Two possible outcomes:
The two groups are equally heavy. (Case A)
One of these groups is heavier than the other. (Case B)
Weigh 7 against 8. Now you have identified the heavier ball in 2 weighing.
Take the heavier group (assume it to be (1,2,3)), take any two balls and weigh them against each other. Either one of these is heavier else the third ball is.
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