Help please

Maria, Latasha, and Kim live in apartments numbered consecutively (n, n+1, n+2). Kim's apartment number added to twice Maria's apartment number is 47, What are the numbers?
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Kim's apartment number is n+2; Maria's is n, so twice this is 2n.

n+2+2n=47, 3n+2=47, 3n=45, n=15. Their apartment numbers are 15, 16, 17.
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