SOLUTION: A chemist prepared 100 mL of 15% saline solution by using a 20% solution, an 18% solution, and 40 mL of a 10% solution. How much of the 20% and 18% were used? Please include an equ

Question 704921: A chemist prepared 100 mL of 15% saline solution by using a 20% solution, an 18% solution, and 40 mL of a 10% solution. How much of the 20% and 18% were used? Please include an equation for setting this problem up if possible. Thanks!
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
x is how much 18% saline
y is how much 20% saline

The system to solve:

Note that you may work the rational equation into
18x+20y+40*10=100*15
18x+20y+400=1500

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