Answer
On average 21.3 pounds less.
Work Step by Step
Total energy intake $E=210\ Cal/day = 76650\ Cal/year$, and since the energy content of fat is 33.1 MJ/kg:
$\Delta m=-9.695\ kg = -21.33\ lbm$
On average 21.3 pounds less.
Thermodynamics: An Engineering Approach 8th Edition
by Cengel, Yunus; Boles, Michael
Published by
McGraw-Hill Education
ISBN 10:
0-07339-817-9
ISBN 13:
978-0-07339-817-4
Chapter 4 - Energy Analysis of Closed Systems - Problems - Page 205: 4-106E
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