In what ratio salt costing Rs.13/kg mixed with another salt

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In what ratio salt costing Rs.13/kg mixed with another salt costing Rs.7/ kg to get a mixture costing Rs.9/kg?

[SSC CHSL 24 March 2018 Evening Shift]

A 4 : 7

B 3 : 5

C 2 : 3

D 1 : 2