the average age of a group of person going for a picnic is 16 years. twenty new person with the average age of 15 years joined the group on the spot. Due to that, the average age of the group became 15.5 years. what is the number of persons initially going for the picnic.
A. 20
B. 25
C. 23
D. 56
সঠিক উত্তরঃ
A.
20
Explanation:
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