Answer:
Step-by-step explanation: Let the number of kilograms of water in human body be N and the mass of the body be M, from the statement ,
N ∝ M
introducing proportionality constant , we have
N = KM
Given from the second statement , N = 56 , M = 84
substitute the given values into the equation to get the constant
i.e 56 = K x 84
56/84 = k
therefore k = 2/3
substitute the value of K into the equation
i.e N = 2/3 M
Finally , to find N when M is 63
⇒ N = 2/3 x 63
therefore N = 42
There are 42 kg of water in a 63 kg person