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Balancing Scales

Problem

In order for the scales to balance the block on the right side must be 10 kg.


It is possible to use the same weights to weigh, for example, 4 kg.


In fact using 2 kg, 3 kg and 5 kg weights it is possible to weigh all but one value from 1 kg to 10 kg. What is that value?
(Note: You don't have to use all three weights.)

Problem ID: 91 (Dec 2002)     Difficulty: 1 Star

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