6th Class Mathematics Arithmetic Question Bank Arithmetic

  • question_answer Three numbers A, B and C are in the ratio 12 : 15 : 25. If the sum of these numbers is 312, then the ratio between the difference of A and B and the difference of C and B is ________

    A) 3 : 10              

    B)          7 : 3

    C) 3 : 7                

    D)          10 : 3

    Correct Answer: A

    Solution :

     \[A:B:C=12:15:25\] Total part 52 one part \[=\frac{312}{52}=6\]  \[A=12\times 6\,=72,\,B=15\times 6\,=90,\,C=25\times 6=150\]\[\frac{B-A}{C-B}=\frac{90-72}{150-90}=\frac{18}{60}\,=\frac{3}{10}\]


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