Question
The average weight of 70 notebooks kept in a box is 7
kg. When a new notebook is placed in the box, then the average is 7.1kg. Specify the weight of the new notebook. (In Kg)Solution
The average weight of the 70 notebooks is = 7 kg Sum of weight of the 70 notebooks = 7 x 70 = 490 kg The average weight of the 71 notebooks is = 7.1 kg Sum of weight of the 71 notebooks is = 7.1 x 71 = 504.1kg Weight of the 71st book = 504.1-490 =14.1 kg
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