There are 8 marbles that weigh 1 ounce each and 1 marble that weighs 1 1 ounces.
Marble riddle scale.
The marbles are all uniform in size appearance and shape.
Mensa level brain teaser on mind bluff.
That is a small dish hangs from each end of a rod that is balanced in the middle.
You have a balance that contains 2 trays.
The remaining marble is slightly heavier than the others.
You can perform up to a maximum of three weighings to find out which marble has the different weight and if it is heavier or lighter than the others.
1 you have 9 marbles as seen.
If when comparing the 6 marbles we find that both sides are equal then we know that the heaviest marble has to be in the 2 marbles that are not on the scale.
You are given a set of scales and 12 marbles.
How do you determine which marble is the heaviest using only the scale and marbles in 2 weighings.
We put 3 marbles on each pan for a total of 6 marbles on the pan and we leave 2 marbles off the pan.
You don t know which is.
Lastly use the scale to weigh the 2 remaining marbles to determine the heavier marble.
The scales are of the old balance variety.
2 8 of them are exactly the same weight.
In any case on to the riddle.
You have 12 marbles.
Use the scale to determine the group that contains the heavier marble.
You are only able to use the scale 2 times.
So let s do this.
This means that we only have to compare on those 2 remaining marbles and we have the heaviest marble in only two weighings.
You can put things in the little buckets and the scale will tip to the heavier side.
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