exam Maths Puzzle Numerical Ability

How do you do roster notation?

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x= (1000) * [ (A-W) / (W) ] ### y= (1000) * [ (W-N) / (N)] ### z= (1000) * [ (A-N) / (N) ] Write z in terms of x and y. Is this even possible? Dear Tutor:
We are using a new form of teaching algrebra called "carnegie math". We do not have an actual math book. Our teachers keep the workbook, and tears out the papers each