41. Finding the Lighter Iron Ball There are 4 iron balls, one with a comparatively little less weight than others which we cannot find by carrying it on the hand. When a beam balance (common balance) is given and only 2 chances are given to find the less weight ball. How will you do it? Added 29 September 2010 Show Solution Solution: Label the balls A, B, C and D. First weighing: put A and B in the left pan and C and D in the right pan. The pan that rises (is lighter) holds the defective pair; the other pair is known to be normal. Second weighing: take the two balls from the lighter pan and weigh them against each other. The pan that rises now shows the single lighter ballโthis is the ball with the lesser weight.
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