SOLUTION: Need help please: A 100% concentrate is to be mixed with a mixture having a concentration of 30% to obtain 50 gallons of a mixture with a concentration of 70%. How much of the 100%

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Question 348913: Need help please: A 100% concentrate is to be mixed with a mixture having a concentration of 30% to obtain 50 gallons of a mixture with a concentration of 70%. How much of the 100% concentrate will be needed?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
(100%)(x) + (30%)(50 - x) = (70%)(50)