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?

1. 

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 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.

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