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?

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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?
[A].
3 : 7
[B].

5 : 7
[C].

7 : 3
[D].

7 : 5 

Answer: Option C

Explanation:

By the rule of alligation:

Cost of 1 kg pulses of 1st kind
Cost 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.