SOLUTION: a chemist needs 16 liters of a 15% saline solution. she has two saline solutions with strenghts 12% and 20% respectively. compute the volume of each solution that should be added t

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: a chemist needs 16 liters of a 15% saline solution. she has two saline solutions with strenghts 12% and 20% respectively. compute the volume of each solution that should be added t      Log On


   

Question 842959: a chemist needs 16 liters of a 15% saline solution. she has two saline solutions with strenghts 12% and 20% respectively. compute the volume of each solution that should be added to get 16 liters of the 15% total mixture
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The assumption used will be that the percents given are as weight per volume for the saline solutions.

%2812u%2B20v%29%2F16=15 and u%2Bv=16

More thorough instruction is :
"Mixing two concentrations for known amount of mixture",
http://www.algebra.com/tutors/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev