Question 1201605
.6 * 600 + 0y = .45 * (600 + y)
simplify to get:
360 = 270 + .45y
solve for y to get:
y = (360 - 270) / .45 = 200
that's your solution.
200 grams of water needs to be added to 60% acid solution to make 45% acid solution.