book Maths Puzzle Numerical Ability

|12y/-3y2 power| Please show how to figure this out

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this is a practice problem for a placement test for college. I have the answer but I dont understand how they got it. Help Please! 7x-8(y-x)+3y= 5(3x-y) Could you please show me all steps to solve the following:

This year Jenny is twice as old as Bev. Next year the sum of their ages will be 50. A third friend Rachel is three qua