exam Maths Puzzle Numerical Ability

42 is 40% of what number?

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exam Other Question

Hi,
Another word problem I'm confused about.

A photocopier, which initially costs $22000, depreciates linearly over 15 years to a scrap value of $1000. Let t= the number of yea 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?