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Chapter 7 Volume
Books for Africa

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Rayyan collected used books to send to a library in Africa. The books she collected are:
• 10 large hardcover books, each measuring 40 cm by 30 cm by 5 cm
• 20 smaller hardcover books, each measuring 30 cm by 20 cm by 4 cm
• 30 paperback books, each measuring 20 cm by 12 cm by 3 cm
The post office sold cube-shaped boxes starting with a side length of 20 cm and increasing by 5 cm to a maximum of 75 cm. Estimate the side length of the smallest cube-shaped box that could hold all of the books. Why is it just an estimate?


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