010-111 · Question #58
A 45 year old male weighs 202 lb (92 kg). Skinfold analysis indicates 24% of his weight is fat. If he wants to decrease his body fat to 17%, what is his target body weight, assuming he maintains the…
The correct answer is C. 185 lb (84 kg). This question tests the ability to calculate target body weight using lean body mass and a desired body fat percentage.
Question
A 45 year old male weighs 202 lb (92 kg). Skinfold analysis indicates 24% of his weight is fat. If he wants to decrease his body fat to 17%, what is his target body weight, assuming he maintains the same lean body mass?
Options
- A168 lb (76 kg)
- B178 lb (81 kg)
- C185 lb (84 kg)
- D195 lb (89 kg)
How the community answered
(29 responses)- A3% (1)
- B7% (2)
- C83% (24)
- D7% (2)
Why each option
This question tests the ability to calculate target body weight using lean body mass and a desired body fat percentage.
168 lb implies excessive weight loss well beyond what is needed, likely resulting from subtracting excess fat mass incorrectly without using the LBM-preservation formula.
178 lb does not result from the correct formula; it likely comes from a rounding or arithmetic error in the LBM or target weight calculation.
Fat mass = 202 x 0.24 = 48.48 lb; Lean body mass (LBM) = 202 - 48.48 = 153.52 lb. Assuming LBM is maintained, target weight = LBM / (1 - desired fat%) = 153.52 / (1 - 0.17) = 153.52 / 0.83 = 184.96 lb, which rounds to 185 lb. This formula correctly preserves LBM while achieving the new fat percentage.
195 lb reflects insufficient fat loss and does not achieve the 17% target, possibly from applying the percentage reduction to total weight rather than using the LBM-based formula.
Concept tested: Target body weight calculation using lean body mass
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