The average weight of 20 student is 33kg. Average weight of all the boys is 35 kg and the average weight of all eight girl is y. Then find y
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33=(8y+12*35)/20
33=2(4y+210)/20
33=(4y+210)/10
4y+210=330
4y=330-210
4y=120
y=120/4
y=30
average weight of all 8 girls is 30.
33=2(4y+210)/20
33=(4y+210)/10
4y+210=330
4y=330-210
4y=120
y=120/4
y=30
average weight of all 8 girls is 30.
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