A suitable equation will equate the quantity of detergent both before and after the water is added to the solution.
the amount of detergent in 11 gal of 18% solution is the same as the amount of detergent in the 12% solution (after g gallons of water are added) .18*11 = .12*(11+g)
Solve the equation for x x by finding a a , b b , and c c of the quadratic then applying the quadratic formula. Exact Form: x = − 7 ± √ 13 6 x = - 7 ± 13 6 Decimal Form: x = − 0.56574145 … , − 1.76759187