• # question_answer 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 : 7C) 7 : 3                             D) 7 : 5

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