RPF 10 Jan 2019

Question 106

The average weight of 93 Notebooks in a box is 9.3 kg. When a new Notebook is added to the box the average goes to 9.4 kg. Find the weight of the new Notebook.

Solution

Average weight of 93 Notebooks in a box = 9.3 kg

=> Total weight = $$93\times9.3=864.9$$ kg

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

=> New average = $$\frac{864.9+x}{94}=9.4$$

=> $$864.9+x=94\times9.4=883.6$$

=> $$x=883.6-864.9=18.7$$ kg

=> Ans - (A)


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