How many gallons of a 25% acid solution should be added with 10 gallons of a 12% acid solution to obtain a 20% acid solution
+37159 Sum of ingredients = sum in final solution
x = amount of 25 % acid content: .25x
10 = amount of 12% .12(10)
fianl product = .20 (10+x)
.25x + .12(10) = .20 (10+ x) solve for 'x' = the amount of 25% to be used in gallons
