exam Maths Puzzle Numerical Ability

Millie is 2/3 as old as maude. Six years from now millie will be 5/7 as old as maude will be. How old is each?

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im confused on how rto wokr this sequence out
0,14, 52, 126, 248
i have tried n cubed but cannot find the answer?
3x(x+1)