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In a primary school the average weigh...

In a primary school the average weight of male students is 65.9 kg and the average weight of female students is 57 kg. If the average weight of all the students (both male and female) is 60.3 kg and the number of male students in the school is 66, what is the number of female students in the school? (a) 162     (b) 168     (c) 180     (d) 112

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