In what ratio must a grocer mix two varieties of pulses costing Rs. 15 and Rs. 2

Question

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?

Options:

A . 3 : 7

B . 5 : 7

C . 7 : 3

D . 7 : 5

Answer: Option C

By the rule of alligation:

Cost of 1 kg pulses of 1^st kind
Cost of 1 kg pulses of 2^nd 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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