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Question
The weight of 65 books is 13 kg.
(i) What is the weight of 80 such books?
(ii) How many such books weigh 6.4 kg?
Sum
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Solution
Weight of 65 books = 13 kg
(i) Weight of 1 book = `13/65` kg
Weight of 80 books = 80 × `13/65=1040/65` = 16 kg
(ii) Number of books weighing 13 kg = 65
Number of books weighing 1 kg = `65/13` = 5
Number of books weighing 6.4 kg = 6.4 × 5 = 32
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