Question
The average weight of 71 notebooks kept in a box is 7.1
kg. When a new notebook is placed in the box, then the average is 7.2kg. Specify the weight of the new notebook. (In Kg)Solution
The average weight of the 71 notebooks is = 7.1 kg Sum of weight of the 71 notebooks = 7.1 x 71 = 504.1 kg The average weight of the 72 notebooks is = 7.2 kg Sum of weight of the 72 notebooks is = 7.2 x 72 = 518.4 Weight of the 72th book = 518.4-504.1 =14.3 kg
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