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?	Pick.
A) 3 : 7 B) 5 : 7 C) 7 : 3 D) 7 : 5 E) 7 : 4
Explanation:   By the rule of alligation:   Cost of 1 kg pulses of 1st kindCost of 1 kg pulses of 2nd kind   Required rate = 3.50 : 1.50 = 7 : 3.   ANSWER IS 7 : 3
<result>C</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?