In what ratio must the grocer mix two types of pulses costing ₹ 15/kg and ₹ 20/kg respectively so as to get una a mixture of pulses costing ₹ 16.50/kg ? 

1
3 ∶ 7
2
5 ∶ 7
3
7 ∶ 3
4
7 ∶ 5

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