Question

PLZ HELP

The number of kilograms of water in a human body varies directly as the mass of the body. An 87-kg person contains 58kg of water. How many kilograms of water are in a 60-kg person.

Answer 1

Since the number of kg of water is going to increase as the mass of a person increases you know that \[Water = R \times Mass\] where R is some constant of proportionality.

Since you have an example including the values for both Water and Mass, you can plug these values into the equation and solve for R.

\[R = Water \div Mass\]

Once you've obtained this value, you plug your new value of Mass and the value for R into the equation \[Water = R \times Mass\] and solve for the new value of Water.

Answer 2

HUH?

Answer 3

\[87 = 58x\]\[x = 87\div 58\ = 1.5\]\[Water = 1.5\times60\ =90\]
Does that make sense now?

Answer 4

a lil

Answer 5

Is there something I can explain more thoroughly?

Answer 6

so the answer is 90?

Answer 7

Yes.

Answer 8

ok THX