in a class two students aged 16yrs and 18 yrs are replaced by two students whose age is 19yrs and 21 yrs.if the avearge age of the cls os increased by 3 months.?How many students are there in the class?

• total number of students are 2.
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• explanation please
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• Total no of student is 24 .
  age increase (19+21) - (16+18)=6yr= 96 months
  avg age increase 3 months
  so 96/3=24
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