Find the ratio in which rice at 7.20 a kg be mixed with rice

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Find the ratio in which rice at 7.20 a kg be mixed with rice at 5.70 a kg to produce a mixture worth Rs.6.30 a kg.

[Railways Group D 2 Nov 2014 With Answers]

A 1:3

B 2:3,

C 3:4,

D 4:5,