Question 943615: Determine the amount of each of the two solutions that must be mixed to make 250 mL of a 40% acid solution. Round to the nearest milliliter.
1.) 25% acid, 80% acid
2.) 30% acid, 60% acid
3.) 15% acid, 75% acid
4.) 10% acid, 45% acid
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! I will do the first, you do the other three using the same method:
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1) 25% acid, 80% acid
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x = mL of first solution
y = mL of second solution
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x + y = 250
0.25x + 0.80y = 0.40*250
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put the system of linear equations into standard form
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x + y = 250
0.25x + 0.80y = 100
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copy and paste the above standard form linear equations in to this solver:
http://sooeet.com/math/system-of-linear-equations-solver.php
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answer:
x = 181.81818
y = 68.181818
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x = 182
y = 68
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