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2016-04-12T23:50:21+05:30

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Given:
20 students 
mean age of 12 students is 18 years
mean age of the remaining students is 23 years

12 * 18 = 216
20 - 12 = 8 * 23 = 184

216 + 184 = 400
400 ÷ 20 = 20

The mean age of all students in the drama class is 20 years.
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