SOLUTION: How many kilograms of water must be evaporated from 80kg of 20 percent salt solution to produce a 25 percent salt solution please hurry and use system of equations

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Question 828883: How many kilograms of water must be evaporated from 80kg of 20 percent salt solution to produce a 25 percent salt solution

please hurry and use system of equations
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
w=amount of water to remove through evaporation;
p = percent concentration starting =20
T= percent concentration wanted as "target" = 25
m = amount of starting mixture = 80 kilograms

The variable as unknown is w.

m%2Ap%2F%28m-w%29=T
-
mp=T%28m-w%29
mp=Tm-Tw
Tm-Tw=mp
-Tw=mp-Tm
Tw=Tm-mp
highlight%28w=%28Tm-mp%29%2FT=m%28T-p%29%2FT%29 Either expression will work.
-
Substitute the given values to finish finding the value for w. This is in kilograms of water to evaporate.