exam Maths Puzzle Numerical Ability

Not owning, need help...
err, its a function.
2x+y=6

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exam Other Question

Anne has two solutions, one with 6% iron and one with 2% iron. How many liters of each solution should be mixed to create 16 Liters of a solution with 3% iron content? What is the domain of g(x)= (2x+1)/(x-3) ?