plz solve this no. this question plz ....
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Answer:
15 yrs
Step-by-step explanation:
Here , The average age of 40 boys = 16 years.
Total age of 40 boys initially = 16 × 40 = 640 years
Age of replaced boy = 17 years
Total age of 39 boys = 640 – 17 = 623 years
New total age = 40 × 15.95 = 638 years
∴ Age of new boy = 638 – 623 = 15 years
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