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    4. HCF and LCM
    5. The sum of two numbers is 65 and their HCF is 13. Total number of such pairs of numbers is?     

    Question

    The sum of two numbers is 65 and their HCF is 13. Total

    number of such pairs of numbers is?     
    A 2 Correct Answer Incorrect Answer
    B 3 Correct Answer Incorrect Answer
    C 1 Correct Answer Incorrect Answer
    D 4 Correct Answer Incorrect Answer

    Solution

    As HCF is 13 so let numbers be 13x & 13y. It means x & y must be co-prime. Now 13x+ 13y = 65, So x + y = 5. Now pairs of (x , y) can be (1,4) , (2,3) and all are co-prime so number of pairs are 2.  

    Practice Next
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