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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?

∴ Required rate = 3.50 : 1.50 = 7 : 3
Solution:
By the rule of alligation, we have:
∴ Required rate = 3.50 : 1.50 = 7 : 3