6 books weigh 1.260 kg.how many books will weigh 3.150
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1.260 kg is weight of 6 books.
1 kg is weight of 6/1.260 books
3.150 kg is weight of (6/1.260)*3.150 = 15 books
1 kg is weight of 6/1.260 books
3.150 kg is weight of (6/1.260)*3.150 = 15 books
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