SOLUTION: Craig is new at Bleachy Clean Cleaning Services. He needs to make 12 gallons of cleaner with a 15% concentration of bleach. He only has cleaners with 10% and 30% solutions. How man

Question 1059299: Craig is new at Bleachy Clean Cleaning Services. He needs to make 12 gallons of cleaner with a 15% concentration of bleach. He only has cleaners with 10% and 30% solutions. How many gallons of the 10% solution will he need?
Found 2 solutions by josgarithmetic, josmiceli:
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
TWO PART MIXTURE Using only ONE variable - Video Example, https://www.youtube.com/watch?v=-REjxT9KCzQ
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = gallons of 10% solution needed
= gallons of 30% solution needed
= gallons of pure bleach in 10% solution
= gallons of pure bleach in 30% solution
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9 gallons of 10% solution are needed
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check:

OK

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