SOLUTION: You need 630 mL of a 85% alcohol solution. On hand, you have two solutions, one is 50% alcohol, the other is 95% alcohol. How much of each will you need to obtain the desired solut

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: You need 630 mL of a 85% alcohol solution. On hand, you have two solutions, one is 50% alcohol, the other is 95% alcohol. How much of each will you need to obtain the desired solut      Log On

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Question 1104058: You need 630 mL of a 85% alcohol solution. On hand, you have two solutions, one is 50% alcohol, the other is 95% alcohol. How much of each will you need to obtain the desired solution?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
x, amount of 50% alcohol
630-x, amount of 95% alcohol

highlight_green%2850x%2B95%28630-x%29=85%2A630%29
-
10x%2B19%28630-x%29=17%2A630
10x%2B19%2A630-19x=17%2A630
10x-19x=17%2A630-19%2A630
-9x=-2%2A630
x=2%2A630%2F9
x=140
-
630-140=490

140 mL of 50% and 490 mL of 95%