Book Maths Puzzle Age Problem

Mary is twice as old as Ann was when Mary was as old as Ann now is. Ann is 57. Mary is how old?

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Book Other Question

if Z is a complex number and |Z - 4/Z | = 2 what is the value of |Z | ? Explain graphically
3x+15y=24
3x-8y =24
Plot points on graph and draw a straight line passing through that two points