SOLUTION: The number of kilograms of water in a person's body varies directly as the persons mass. A person with a mess of 90 kg contains 60 kg of water. How many kilograms of water are in a

Algebra ->  Linear-equations -> SOLUTION: The number of kilograms of water in a person's body varies directly as the persons mass. A person with a mess of 90 kg contains 60 kg of water. How many kilograms of water are in a      Log On


   

Question 1083582: The number of kilograms of water in a person's body varies directly as the persons mass. A person with a mess of 90 kg contains 60 kg of water. How many kilograms of water are in a person with a mess of 50 kg?
Found 2 solutions by Boreal, josmiceli:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
M=k*W, W=water weight in kg
90=k*60
k=1.5
use k for second part
50 kg=1.5*W
W=50/1.5=33.33 kg

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +k+ = constant of proportionality
+90+=+k%2A60+
+k+=+1.5+
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Let +x+ = kg of water
+50+=+k%2Ax+
+x+=+50%2Fk+
+x+=+50%2F1.5+
+x+=+33.333+
There are 33 and 1/3 kg of water in a
person with mass of 50 kg