2. Sample Papers
  3. Railways

Railways Sample Paper RRB (Group D) Sample Test Paper-14

  • question_answer
    The L.C.M. of two number is 630 and their H.C.F. is 9. If the sum of numbers is 153, their difference is

    A)  17                   

    B)  23

    C)  27                   

    D)  33

    Correct Answer: C

    Solution :

    [c] Let numbers be x and y. \[\therefore Product\,\,of\,\,two\,\,numbers=their\,\,(LCM\times HCF)\]\[\Rightarrow \,\,\,xy=630\times 9\] \[Also,\,\,x+y=153\,\,(given)\] \[since\,\,x-\,y=\,\,=\sqrt{{{(x+y)}^{2}}-4xy}\] \[\Rightarrow x-y=\sqrt{{{(153)}^{2}}-4\,\,(630\times 9)}\] \[=\sqrt{23409-\,22680}=\sqrt{729}=27\]


You need to login to perform this action.
You will be redirected in 3 sec spinner