College Algebra 2
posted by Francine on .
The number of kilograms of water in the human body varies dirctly as the mass of the body. An 84kg person contains 64kg of water. How many kg of water is in a 63kg person?

water = k(mass) , where k is a constant
given water = 64 kg when mass = 84 kg
64 = k(84)
k = 64/84 = 16/21
water = (16/21)(mass)
when mass = 63
water = (16/21)(63) = 48 kg 
80.try doing it. It easy

The number of kilograms W of water in a human varies directly to the mass of the body. A 96_kg person contains 64 kg of water. How many kilograms of water are in a 60_kg person?