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Answer with Explanation:

By the rule of Alligation:

Cost of 1 kg pulses of 1st kind :=> Rs.15   (3.50)

Cost of 1 kg pulses of 2nd kind :=> Rs.20   (1.50)

Mean Price:=>Rs.16.50
 
Therefore,Required rate = 3.50 : 1.50 = 7 : 3.
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