How to weigh any weight from 1 to 40 using four weights whose sum is 40KG? A merchant has a 40 kg weight which he used in his shop. Once, it fell from his hands and was broken into 4 pieces. But surprisingly, now he can weigh any weight between 1 kg to 40 kg with the combination of these 4 pieces.
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1+3+9+27=40
9-3+1=5
9-3=6
9+1-3=7
9-1=8
9+3-1=11
27-9-3-1=14
9-3+1=5
9-3=6
9+1-3=7
9-1=8
9+3-1=11
27-9-3-1=14
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