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    Question

    What number should be subtracted from both the terms of

    the ratio 17 : 21 so as to make it as 1 : 2 ?
    A 12 Correct Answer Incorrect Answer
    B 13 Correct Answer Incorrect Answer
    C 14 Correct Answer Incorrect Answer
    D 15 Correct Answer Incorrect Answer

    Solution

    Required number = x =`(17-x)/(21-x)=1/2` ⇒ 34 - 2x  = 21 - x ⇒ 2x - x  = 34 - 21 ⇒ x  = 13

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