Question 852956
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Hi,
how many {{{ highlight_green(x)}}}gallons of 30% salt solution must be added to 5 gallons of 10% salt solution 
to yield a {{{ highlight_green(5gal + x)}}}solution of 17.5% salt
 .30x + .10(5gal) = .175(5gal + x)
 .30x + .10(5gal) = .175(5gal) + .175x
           x = .075(5gal)/.125 = 3gal