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7 tennis balls are identical in every way, except that one of them weighs slightly less than the other 6. How can you identify the lightweight ball with no more than two separate weighings using a balance scale?

frankg1:
7 tennis balls are identical in every way,
except that one of them weighs slightly less
than the other 6. How can you identify the
lightweight ball with no more than two
separate weighings using a balance scale?

place 3 balls each on each sides of the balance scale ...if the balance scale is in equilibrium then uve gotten the odd ball

But if this is not the case I.e the weighing balance tilts then the lighter should be on the side that tilts upwards...now you take ur second weighing placing one ball each (from the 3 lyter part) on the weighing scale..again if the scale is in equilibrium den the 3rd ball is your lighter ball but if it is not then the side that tilts upwards is ur lighter ball..

BETATRON:
place 3 balls each on each sides of the balance scale ...if the balance scale is in equilibrium then uve gotten the odd ball

But if this is not the case I.e the weighing balance tilts then the lighter should be on the side that tilts upwards...now you take ur second weighing placing one ball each (from the 3 lyter part) on the weighing scale..again if the scale is in equilibrium den the 3rd ball is your lighter ball but if it is not then the side that tilts upwards is ur lighter ball..

Nice one