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posted by Sally on Tuesday, August 2, 2011 at 11:43am.
A pile of 108 identical books has a mass of 30 kg. Find (a)the mass of 150 books and (b)the number of books that has a mass of 20 kg.
Use proportions. Cross multiply and solve for x. 108/30 = 150/x 108/30 = x/20
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