Problema Solution
To mix a saline solution, 1/3 gallon of saline is used for every 2 gallons of water. How much saline is needed if it is to be mixed with 3 1/2 gallons of water?
Answer provided by our tutors
let 'x' be the gallons of saline needed for the mix
1/3 : 2 = x : 3 1/2
3 1/2 = (3*2 + 1)/2 = 7/2
1/3 : 2 = x : 7/2
by solving we find
x = 7/12 gal
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