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In what ratio must a grocer mix two varieties of food grains 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 and Explanation

Answer:7 : 3

Explanation:
By the rule of alligation:
Cost of 1 kg food grain of 1st kind Cost of 1 kg food grain of 2nd kind

Rs. 15 Mean Price Rs. 20
3.50 Rs. 16.50 1.50

Required rate = 3.50 : 1.50 = 7 : 3

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