167k views
1 vote
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​

User Seafoxx
by
7.5k points

1 Answer

2 votes

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.

User John Ernst
by
7.8k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories