if you have 9 balls, and a scale, and one of the balls weighs slightly more than the rest, how do you find the one ball that weights more, and the weight dosent tell the weight, it is one of thoes where you put some stuff one one side, and then stuff one the other side.
2007-01-30 11:45:22 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
you only get 2 times to use the scale
2007-01-30 12:49:08 · update #1
put 4 on one side and 4 on the other, if they balance its the ball you left off, if they dont then its one of the ones on the side that goes down. If this happens, remove one ball from that side, replace it with the one you left off and see if it balances, if it does then its the ball you took off, if not take another off the side that went down and repeat.
2007-01-30 11:53:16 · answer #1 · answered by ? 4 · 0⤊ 0⤋
Try it like this: Put four balls on each side. If the scale is even, you know the ninth ball is the heavy one. If not, you know it is among the heavy four. Put those on the scale, and you know which pair contains the heavy ball. Pair those off and you have it. Minimum operations, one; maximum operations, three.
2007-01-30 19:54:02 · answer #2 · answered by obelix 6 · 0⤊ 0⤋
frist does it tell you what the balll weight. I
2007-01-30 20:03:37 · answer #3 · answered by ? 3 · 0⤊ 0⤋