SOLUTION: How many liters of a 9% solution of salt should be added to a 21% solution in order to obtain 540 liters of a 15% solution?
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Question 703984: How many liters of a 9% solution of salt should be added to a 21% solution in order to obtain 540 liters of a 15% solution?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Notice that 15 is exactly in the middle of 9 and 21. EXACTLY. Maybe half of 540 liters of each solution?
x and y are liters volume of the 9% and the 21% respectively, to use.
x+y=540.
Account for the percntages,
Substitute x=540-y into this equation,
Continue to find y...
liters
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