SOLUTION: The number of kilograms (W) of water in the human body varies directly as the total body weight (B). A person who weighs 100 kilograms contains 60 kilograms of water. How many kilo

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: The number of kilograms (W) of water in the human body varies directly as the total body weight (B). A person who weighs 100 kilograms contains 60 kilograms of water. How many kilo      Log On


   

Question 373755: The number of kilograms (W) of water in the human body varies directly as the total body weight (B). A person who weighs 100 kilograms contains 60 kilograms of water. How many kilograms of water are in a person who weighs 70 kilograms?

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi,

Let x represent the kilograms of water in a person who weighs 70 kilograms

Setting up the proportion:

%28100g%2F60g%29+=+%2870g%2Fx%29

cross multiplying to solve for x

100gx = 70*60g^2

x = 4200g^2/100g = 42g, kilograms of water in a person who weighs 70 kilograms