book Maths Puzzle Numerical Ability

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

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|12y/-3y2 power| Please show how to figure this out How does the problem (3x to the fourth power y to the third power)(4x to the fourth power y) work.