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Answer 1 · 2017-09-12T21:16:02

$"Mass of fat" approx 25.3$ $"pounds"$

According to Wikipedia, body fat percentage is defined as the total mass of fat divided by total body mass.

We are already provided with the individual's body fat percentage of $19.8%$ , or $0.198$ , and body mass of $128$ pounds.

So let's find the weight of his body fat:

$Rightarrow 0.198 = frac("Mass of fat")(128 " pounds")$

$Rightarrow 0.198 times 128$ $"pounds"$ $=$ $"Mass of fat"$

$Rightarrow "Mass of fat" = 25.344$ $"pounds"$

Rounding to the nearest tenth:

$therefore "Mass of fat" approx 25.3$ $"pounds"$