exam Maths Puzzle Numerical Ability

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

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exam Other Question

How many ounces of pure salt must be added to 60 oz. of a 12% salt solution to make a 20% salt solutuion? The polynomial f(x) divided x-3 results in a quotient of x squared+3x-5 with the remainder of 2. Find f(3).