The number of kilograms of water in a human body varies directly as the mass of the body. An 84-kg person contains 56 kg of water. How many kilograms of water are in a 72-kg person?

The answer is 48 kg of water

Step-by-step explanation:

If kg of water varies directly with kg of human body

84 kg p = 56 kg w

72 kg p = ? kg w

If we cross multiply, we will have

? 84 = 56*72

? 84 = 4032

Divide both side by 84 to get the value of the unknown?

? = 4032/84

? = 48 kg of water