Question 68

The average weight of 101 Notebook in a box is 10.1 kg. When a new Notebook is added to the box the average goes to 10.2 kg. Find the weight of the new Notebook.

Solution

Average weight of 101 Notebooks in a box = 10.1 kg

=> Total weight = $$101\times10.1=1020.1$$ kg

Let weight of new book = $$x$$ kg

=> New average = $$\frac{1020.1+x}{102}=10.2$$

=> $$1020.1+x=102\times10.2=1040.4$$

=> $$x=1040.4-1020.1=20.3$$ kg

=> Ans - (D)

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