A person weighs 70.0 kg and has 14.0 kg of body fat measured by a reliable method. Calculate the percent body fat and percent lean mass. Show the steps and final percentages.

• A. Percent body fat = 20.0%; Percent lean mass = 80.0%.
• B. Percent body fat = 15.0%; Percent lean mass = 85.0%, after subtracting 1 kg for estimated gastrointestinal contents and clothing, which is standard in all percent fat calculations.
• C. Percent body fat = 18.5%; Percent lean mass = 81.5%, because lean mass must be adjusted for a hydration constant of 0.95.
• D. Percent body fat = 22.5%; Percent lean mass = 77.5%, using the Siri equation for conversion between body density and percent fat without providing body density here.

Answer: (A)