a man spent 1/10 of his monthly salary on rent and 5/6 of the remainder on household needs. if $1,800 is left, how much is his monthly salary?

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  1. after 1/10, 5/6 of the remainder is 5/6 * 9/10 = 45/60 = 3/4

    so, x(1 - 1/10 - 3/4) = 1800
    3/20 x = 1800
    x = 12000

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