In what ratio must a grocer mix two varietiesof tea costing

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In what ratio must a grocer mix two varietiesof tea costing Rs.15 and Rs.20perkg respectively so as to get a mixture worth Rs.16.50 perkg ?

[Railways Group D 08 Dec 2016 With Answers]

A 3:7

B 5 : ?,

C 7 : 3,

D None of the above,