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There are 8 marbles, one of which is heavier than the rest. The remaining marbles have equal weights. You also have an old style scale, which is of a balancing type. What is the minimum number of weighings such that you can determine the heavier marble? Also, describe how you would do so.
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Quantitatiave Research Associate

Interviewed at Susquehanna International Group

3.8
Oct 31, 2013

There are 8 marbles, one of which is heavier than the rest. The remaining marbles have equal weights. You also have an old style scale, which is of a balancing type. What is the minimum number of weighings such that you can determine the heavier marble? Also, describe how you would do so.

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