Question

the average age of a class of 20 students is 15 years and the average age of another class of 30 students is 20 years .find the average age of students into classes​

Answer 1

Let’s say the first class is X.

Avg(X)= x/20=15

X=300

Let’s say the second class is Y.

Avg(Y)= Y/30=20

Y=600

X+Y=900

AVG(X+Y)=900/(20+30)=900/50=18

The average of both classes is 18.

Answer 2

Step-by-step explanation:

AVERAGE AGE OF 20 STUDENTS=15

AVERAGE AGE OF 30 STUDENTS=20

THEREFORE SUM OF Ages of 20 students=300

And sum of Ages of 30 students=600

Therefore Average age of 50 students =900/50=18