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The manager of a fish store has water that is 10% salt and water that is 25% salt. He needs to fill an aquarium with 10 gallons of water that is 20% salt.
use a linear equation to find how many gallons of each type of salt water to combine

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J.R. S. | Ph.D. in Biochemistry--University Professor--Chemistry TutorPh.D. in Biochemistry--University Profes...
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Let x = gallons of 10% salt
Let 10 gallons - x = gallons of 25% salt
(x)(10%) + (10-x)(25%) = (10)(20%)
10x + 250 - 25x = 200
-15x = - 50
15x = 50 
x = 3.33 gallons of 10% salt + 6.67 gallons of 25% salt