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Railways R.R.C. (Patna) Solved Paper Held on 1st Shift 16-11-2014

  • question_answer
    If a : b = 2 : 3 and b : c = 4 : 5, then\[{{a}^{2}}:{{b}^{2}}:bc=?\]

    A) 4 : 9 : 45                      

    B) 16 : 36 : 45

    C) 16 : 36 : 20                   

    D) 4 : 36 : 40

    Correct Answer: B

    Solution :

    a : b : c = 8 : 12 : 15 Now, \[{{a}^{2}}:{{b}^{2}}:bc={{8}^{2}}:{{12}^{2}}:12\times 15\] \[=64\,\,\,:\,\,\,144\,\,\,:\,\,\,180\]  \[=16:36:45\]


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