Measuring Kilograms

Puzzles -> Measuring Puzzles

In front of you is a balance.

Can you devise a system, using only 4 weights, that can measure any whole number of kilograms (1,2,3, etc) …

a) ... up to 15 kg ?
b) ... up to 40 kg ?
c) ... up to 80 kg ?

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-\./^\./-

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