Answer
$ 3 \times 10^6 $ cows
Work Step by Step
The US consumes about $3\times 10^{10}$ kg of milk each year. Thus, we obtain:
$$ 3 \times 10^{10}/ 10^4 kg = 3 \times 10^6 \space cows$$
Essential University Physics: Volume 1 (3rd Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0321993721
ISBN 13:
978-0-32199-372-4
Chapter 1 - Exercises and Problems - Page 12: 41
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