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10 August, 16:37

The age of Oscar is 1/3of his sister. after 12 years his age will be half that of his sister. What is Oscar's current age

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  1. 10 August, 18:03
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    Let's denote:

    Age of Oscar : x

    Age of Oscar's sister : y

    Then, we have:

    3x = y (1)

    2 (x + 12) = y + 12 (2)

    Substitute y from (1) into (2), then:

    => 2 (x + 12) = 3x + 12

    => 2x + 24 = 3x + 12

    => x = 24 - 12

    => x = 12

    => Oscar's current age: 12
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