exam Maths Puzzle Numerical Ability

How many kilograms of nicker silver containing 18% zinc and how many kilograms of nickel silver containing 31% zinc must be melted together to produce 700kg of a new nickle silver containing 22% zinc???

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exam Other Question

How many square inches is the plate? Quadratic equations can be solved by graphing, using the guadratic formula, completing the square and factoring. What are the pros and cons of each of these methods? When might each method be most appropriate? Why method do you prefer and why?