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7 November, 13:03

An apartment building contains 12 units consisting of one - and two-bedroom apartments that rent for $360 and $450 per month, respectively. when all units are rented, the total monthly rental is $4,950. what is the number of twobedroom apartments?

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  1. 7 November, 15:43
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    X = one bedroom apts and y = 2 bedroom apts

    x + y = 12 ... x = 12 - y

    360x + 450y = 4950

    360 (12 - y) + 450y = 4950

    4320 - 360y + 450y = 4950

    -360y + 450y = 4950 - 4320

    90y = 630

    y = 630/90

    y = 7 ... so there are 7 two bedroom apts <==
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