find the average age of group of 150people , if the average age of 50people is 30 and that of the other 100people is 60
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x/50=30 there fore x=1500,
y/100=60 there forever y =6000
for 150 people
that is x+y = 7500
and average age of 150 people is
7500/150 = 50 ans
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