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9 November, 10:14

The apartments in Ericas apartment house are consecutively numbered on each floor. The sum of her and next door neighbor's number is 2409. What are the two numbers?

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  1. 9 November, 14:05
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    Let x be the number of Ericas's apartment, the number of her neighbor will be

    x+1, so

    x + x+1 = 2409

    2x = 2408 and x = 1204 and her next door neighbor's is 1205
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