Posted by wan on Saturday, November 24, 2012 at 9:49am.
a class consists of 24 boys and 16 girls.the average weight of the class is 41.7 kg,and the average weight of the boys is 41.1 kg.Find the average weight of the girls.

math  Steve, Saturday, November 24, 2012 at 11:11am
24*41.1 + 16g = (24+16)*41.7
g = 42.6

math  PsyDAG, Saturday, November 24, 2012 at 11:25am
Mean boys = 41.1 = ∑x/n = ∑x/24
∑x = 986.4
Mean class = 41.7 = ∑y/40
∑y = 1,668
Mean girls = (1668986.4)/16 = ?
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