The average of some people is 75. 5 people whose average is 66.6, join the group and 13 people whose average is 72, exit the group, then overall average is decreased by 1.62.Find the number of people initially
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the average of people is 75.5 , 66.6who join the group and 13 people whose average is 72.
Answer:so the average of people is total of 142.0 and the people who join is 70 people
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