Answer:
(a) [tex]41 \frac{2}{3}[/tex] kg
(b) 72
Solution:
(a) the mass of 150 books
Since the mass of 108 books is 30 kg, each book has a mass of 30/108 kg.
Hence the mass of 150 books is 150(30/108) = 4500/108 or 41 2/3.
(b) the number of books that has a mass of 20 kg.
Since 20 kg is 2/3 of 30 kg and 108 books has a mass of 30 kg, the no. of books that has a mass of 20 kg is also the two - thirds of the book.
Therefore 108 x 2/3 = 72.
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