exam Maths Puzzle Numerical Ability

y= -x+3

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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??? how would I solve for f1 in an equation that is V=speed(f1-f0)/(f1+f0). what is the equation for f1