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the average age of a group of person going for a picnic is 16 years. twenty new person with the average are of years joined the group on the spot. Due to that, the average age of the group became 15 half years. what is the number of persons initially going for the picnic.

A. 20
B. 25
C. 23
D. 56
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সঠিক উত্তরঃ A. 20
Explanation: