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FIND A FRACTION SUCH THAT: IF YOU ADD 2 TO THE NUMERATOR, IT BECOMES EQUIVALENT TO 0.5; AND IF YOU ADD 4 TO THE DENOMINATOR, IT BECOMES EQUIVALENT TO 0.1.

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    (n + 2)/d = 0.5
    n/(d+4) = 0.1
    n = 0.5 d - 2
    n = 0.1 d + 0.4
    0.4 d = 2.4
    d = 6
    (n+2)/6 = 0.5
    n+2 = 3
    n = 1
    The original number is n/d = 1/6

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