Railways R.R.C. (Ajmer) Solved Paper Held on 1st Shift 2-11-2014

  • question_answer 31) In what ratio must a grocer mix two varieties of rice costing Rs. 15 and Rs. 20 per kg respectively so as to get a mixture worth Rs.16-50 per kg?

    A) 3 : 7                             

    B) 5 : 7

    C) 7 : 3                             

    D) 7 : 5

    Correct Answer: C

    Solution :

    Let the required ratio is x : y, then as per question? \[15x+20y=16.50(x+y)\]  \[\Rightarrow \]  \[=16.50x+16.50y\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,3.5y=1.5x\] \[\therefore \]      \[\frac{x}{y}=\frac{3.5}{1.5}\] \[=\frac{7}{3}=7:3\]

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