algebra
posted by karon .
the number of kilograms of water in a human body varies directly as the mass of the body an 87kg person contains 58kg of water how many kilograms of water are in a 72kg person

water = k(bodymass) where k is a constant
for the given case
58 = k(87)
k= 58/87
= 2/3
water = (2/3)(bodymass)
so if bodymass = 72
water = (2/3)(72) = 48