SOLUTION: A mixture of 15% disinfectant solution is to be made from 13% and 18% disinfectant solution. How much of each solution should be used if 20gallons of the 15% solution are needed?

Question 1051796: A mixture of 15% disinfectant solution is to be made from 13% and 18% disinfectant solution. How much of each solution should be used if
20gallons of the 15% solution are needed?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = gallons of the 13% mixture needed
Let = gallons of the 18% mixture needed
--------------------------------------------
(1)
(2)
----------------------------------
(1)
(1)
(1)
------------------------------
Multiply both sides of (2) by
and subtract (2) from (1)
-----------------------------------
(1)
(2)
----------------------------

and
(2)
(2)
12 gallons of the 13% mixture are needed
8 gallons of the 18% mixture are needed
---------------------------------------
check:
(1)
(1)
(1)
(1)
(1)
(1)
OK

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