In a prep school, the average weight of 30 girls in a class

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In a prep school, the average weight of 30 girls in a class among 50 students is 16 kg and that of the remaining students is 15 .5 kg. What is the average weight of all the students in the class ?

[SSC GD 2012 Shift 1]

A 15.2 kg

B 15.8 kg,

C 15.4 kg,

D 15.6 kg,