Answer
$$\frac{120\; pounds}{600 nails} = 0.2 \frac{pounds}{nail}$$
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 13 - Think and Solve - Page 260-261: 37
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