4. The number of kilograms of water in a person's body varies directly with the
person's mass. A person with a mass of 90 kg contains 60 kg of water. How many
kilograms of water will be there in a person with a mass of 50 kg?
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Answer:
Let the no of water kilgrams in person with mass 50 kg be x.
Ratio of mass of a person with water capacity of person = 90kg ; 60kg = 3:2
mass of a person = 50 kg
to find Kilograms of water
50 kg/ x =3/2
1/x = 3/100
x = 100/3 = 33.33333333 kg.
hope it helps
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