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Frances: 15 years old
Judy: 2 x 15 = 30 years old (twice as old as Frances)
Carmen: 30 - n

Expression to that represents Carmen's age in relation to Judy's age who is n years older than Carmen:

30 - n

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Let's start with Frances' age. Let's say, the answer will come from Frances' age as his/her age was already given
Frances = 15

Based on your question, Judy is twice as old as Frances so...
15 (2) = 30 - Judy's age

And now, for Carmen's age (in terms of n)
30 - n = Carmen

Therefore, the answer to your question is 30 - n.

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