exam Maths Puzzle Numerical Ability

how many ounces of water must be added to 20 ounces of 8% salt solution to make 2% salt soltion

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Review the text on p 605 for help in solving Problem 46. It might also help to note that slope can be defined as being rise over run (change in vertical position divided by change write the equation of the line wuth x intercept (12,0) and y intercept (0,-2). Thank you.