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average is 7 kg so total weight will be 21 kg,
now median is 9 kg means middle box is of 9 kg weight
so other two box weight will be 21-9 = 12 kg..
now they used lighest word in question mean 6 -6 is not possible
other possible combination would be 5-7 ,4-8, 3-9 , 2-10 ,1-11
so maximum weight will be 5kg for lighest box..........
What is median of 3-9-9 ? is it 9?
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