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There are 8 stones which are similar except one which is
heavier than the others. To find it, you are given a pan
balance. What is the minimal number of weighing needed to
find out the heaviest stone ?
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Answer / murthy
Answer is 2.
Solution:
Divide the stones into 3,3,2. Put 3 stones on left pan and
3 stones on right pan. If heavier stone is present in any
one of the side then that side will get down. Take the 3
stones from that side and again put 1 stone on left and 1
on right. We can find the heavier stone from this. If both
are equal then the remaining one is heaviest.
While dividing the stones as 3,3,2 when both sides are
equal then take the remaining 2 stones and put it on left
and right.
| Is This Answer Correct ? | 30 Yes | 0 No |
Answer / vishwa
Answer : 2
hint : divide the stones into 3,3,2 groups
| Is This Answer Correct ? | 10 Yes | 0 No |
divide the stones 3,3,2. put 3 stones in both sides of the
pan balance. if the stones have equal weight.if there is no
deviation in pan balance.Then put remaining 2 stones in the
pan balance.Then we take the weightiest ball in the 8 stones
with 2 times weighted.
| Is This Answer Correct ? | 7 Yes | 2 No |
Answer / prasaanth
The answer is 2, 3 balls on each of the pans of the
balancing scales, should the scales balance then from the
remaining 2, we can find the heavier ball through another
comparison which gives 2 comparisons, however in the first
place should the balance not balance, then from the heavier
group, pick 2 more balls (from 3) and weigh them, if the
scales balance then the remaining ball is the heaviest one
and if the scales do not balance then the one that is heavy
can be seen from that instant itself-- THUS THE MOST
OPTIMAL ANSWER IS "2"
| Is This Answer Correct ? | 5 Yes | 1 No |
Answer / shameer
2
3 3 2
3=3 , then weigh the other 2
else if
3!=3
get the lighter one (3)
take 2 at a time weigh.
i think u got it
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / alphy
Ans 2.
3 ---|----- 3 if same weight take the other two
obliviously one will be hevier than the other.
otherwise
in case of 3-----|----3 if one side is heavier, take those 3
keep 1--------|--------1 and check if both same and the
remaining one from the group of 3 we kept will be heavier,
otherwise one among the two we weighed will be heavier
so ans is 2.
| Is This Answer Correct ? | 2 Yes | 0 No |
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