Question

the average of a class of 20 boys is 15 years if 8 boys of 18 years average age join the class find the new average of the class​

Answer 1

Answer:

444/28=15.85years

.........

Answer 2

Dear Student,

◆ Answer -

New average = 15.86 yrs

● Explanation -

Sum of ages of 15 yrs boys -

Sum = 20 × 15

Sum = 300 yrs

Sum of ages of 18 yrs boys -

Sum = 8 × 18

Sum = 144 yrs

Average of the class is -

New average = (300 + 144) / (20 + 8)

New average = 444 / 28

New average = 15.86 yrs

Hence, the new average of the class is 15.86 yrs.

Thanks dear. Hope this helps you...