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Sagot :
First, we have to remember what a mass percentage (in a body) is:
[tex]\%\text{ m/m = }\frac{mass\text{ of substance}}{mass\text{ of the body}}*100[/tex]We have the percentage and the body's mass. It means that we can calculate the amount of fat that these people have:
[tex]\begin{gathered} 3.0\text{ }\%\text{ = }\frac{mass\text{ of body fat}}{77\text{ kg}}*100 \\ \\ Clearing\text{ the equation: } \\ \\ mass\text{ of body fat = }\frac{3.0\text{ }}{100}*77\text{ kg = 2.31 kg} \end{gathered}[/tex]Now, we can use the conversion factor to convert the kg to pounds:
[tex]2.31\text{ kg * }\frac{2.20462\text{ lb}}{1\text{ kg}}=\text{ 5.0927 lb }\approx\text{ 5.1 lb}[/tex]Then, these athletes have 5.1 lb of body fat on average.
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