Question

the average age of 30 boys of a class is 14.4 years. 10 new boys join the class and the average become 13.9 years. Find the average age of new boys​

Answer 1

Answer:41 years

Solution: Given

The average age of 30 boys in a class is 10 years. If the age of their teacher is also included, the average increases by one year

Formula used

Average = total sum of observation/number of observation

Calculation

Total sum of age of 30 boys = 10 × 30 = 300 years

⇒ After adding teacher new average = 11 years

⇒ New sum = 11 × 31 = 341 years

∴ Teacher's age is 341 - 300 = 41 years..

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