Some athletes have as little as 3.0% body fat. If such a person has a body mass of 80 kg, how many pounds of body fat does that person have Express your answer using two significant figures.

Answer 1

To find the pounds of body fat, we need to know the amount of body fat as a percentage of the body mass and then convert the body mass from kg to pounds.

If the person has 3.0% body fat, it means their body fat is 3.0% of their body mass.
Thus, the body fat is (3.0/100) * 80 kg = 2.4 kg.

To convert the body mass from kg to pounds, we know that 1 kg is approximately equal to 2.20462 pounds.
Therefore, the person's body mass in pounds is 80 kg * 2.20462 pounds/kg ≈ 176.3696 pounds.

Finally, to find the amount of body fat in pounds, we multiply the body fat in kg by the conversion factor:
2.4 kg * 2.20462 pounds/kg ≈ 5.2911 pounds.

Rounding to two significant figures, the person has approximately 5.3 pounds of body fat.