Question

the average age of 5 boys is 12. the average age of 3 other is 16.the average age of all the 8 boys is

Answer 1

Average age of 5 boys-12
Total age of 5 boys =12×5=60
Average age of 3 boys=16
Total age of three boys=16×3=48
Therefore,total age of 8 boys=48+60=108
Average age of 8 boys=108/8=13.5
Ans)The average age of all the 8 boys is 13.5

Answer 2

Answer:

$\huge\sf\underline{\pink{An}\purple{sW}\green{eR}}$

Solution:

Total age of 5 boys= 12$\bold\times{5\:=60}$

Total age of 3 boys = 16$\bold\times{3\:=48}$

Average= $\frac{Sum\:of\:total (Age\:of\:8\:boys\:here)}{Total\: Observation (8)}$

$\frac{60\:+\:48}{8}$

$\frac{108}{8}$

${13.5}$