What percentage range of body weight is water?

• A. 40-50
• B. 70-90
• C. 50-70
• D. 30-40

Answer: (C)

Water is the largest component of the body by weight. In adults, total body water typically makes up about half to a bit more than half of body weight, roughly around 60% for men and a bit less for women, with some variation due to age and body composition. The range 50-70% captures this common variation, making it the best fit for most adults. The other ranges fall outside the usual adult values: 40-50% is generally too low, 70-90% too high, and 30-40% also too low.