exam Maths Puzzle Numerical Ability

How many ounces of pure salt must be added to 60 oz. of a 12% salt solution to make a 20% salt solutuion?

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exam Other Question

6r+3/r+6*r^2+9r+18/2r+1

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What is the answer for thes:
3/5x+2y/5=1
2/5x-2y=12