1. The average weight of 63 Notebooks in a box is 6.3 kg. When a new Notebook is added to the box the average goes to 6.4 kg. Find the weight of the new Notebook. (in Kg)





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  • By: anil on 05 May 2019 01.13 am
    Average weight of 63 Notebooks in a box = 6.3 kg => Total weight = $$63 imes6.3=396.9$$ kg Let weight of new book = $$x$$ kg => New average = $$frac{396.9+x}{64}=6.4$$ => $$396.9+x=64 imes6.4=409.6$$ => $$x=409.6-396.9=12.7$$ kg => Ans - (B)
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