SOLUTION: A mixture of 10% disinfectant solution is to be made from 11% and 7% disinfectant solutions. How much of each solution should be used if 44 gallons of 10% solution are needed?
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Question 418674: A mixture of 10% disinfectant solution is to be made from 11% and 7% disinfectant solutions. How much of each solution should be used if 44 gallons of 10% solution are needed? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! Let = gallons of 11% solution needed
Let = gallons of 7% solution needed
given:
(1)
(2)
------------------
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)
and, since
33 gallons of 11% solution are needed
11 gallons of 7% solution are needed
check answer:
OK
