SOLUTION: A 30% acid solution is to be mixed with a 50% acid solution to get 100 milliliters of a 35% acid solution. How many milliliters of 30% are needed

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Question 371779: A 30% acid solution is to be mixed with a 50% acid solution to get 100 milliliters of a 35% acid solution. How many milliliters of 30% are needed
Answer by amoresroy(361) About Me  (Show Source):
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A 30% acid solution is to be mixed with a 50% acid solution to get 100 milliliters of a 35% acid solution. How many milliliters of 30% are needed
Let x = the number of milliliters of 30% needed
100-x = the number of milliliters of 50% needed
0.30x + 0.50(100-x) = .35(100)
0.30x + 50 - 0.5x = 35
-0.2x = 35-50
x = 75

75 milliliters of 30% are needed