In what ratio must a grocer mix two varieties of pulses costing Rs. 15 and Rs. 20 per kg respectively so as to get a mixture worth Rs. 16.50 kg?  Choose the correct choice from the following:  A) 7 : 2  B) 7 : 3  C) 7 : 5  D) 7 : 7  E) 7 : 9
By the rule of alligation:   Cost of 1 kg pulses of 1st kindCost of 1 kg pulses of 2nd kind   Rs. 15	Mean Price   Rs. 16.50	Rs. 20   3.50	1.50   Required rate = 3.50 : 1.50 = 7 : 3.   Option 7 : 3
<result>B</result>
In what ratio must a grocer mix two varieties of pulses costing Rs. 15 and Rs. 20 per kg respectively so as to get a mixture worth Rs. 16.50 kg?