In what ratio must a grocer mix two varieties of pulses costing Rs.15 and Rs. 20 per kg respectively to
obtain a mixture worth Rs.16.50 per Kg? Choices
A) 1 : 2  B) 2 : 1  C) 3 : 7  D) 7 : 3  E) None of these
Explanation :   By the rule of alligation,we have   CP of 1 kg of 1st variety pulse CP of 1 kg of 2nd variety pulse   15 20   Mean Price   16.5   20-16.5= 
<gadget id="calculator">20-16.5</gadget>
<output>3.5</output>
3.5 16.5-15=1.5   Required Ratio = 3.5 : 1.5 = 35 : 15 = 7 : 3   Answer : Option 7 : 3
<result>D</result>
In what ratio must a grocer mix two varieties of pulses costing Rs.15 and Rs. 20 per kg respectively to
obtain a mixture worth Rs.16.50 per Kg?