SOLUTION: There are 20 students in class X, 40 students in class Y, and 60 students in class Z. If the respective averages of classes X, Y, and Z are 90, 75, 70, what is the average of the t
Algebra.Com
Question 762256: There are 20 students in class X, 40 students in class Y, and 60 students in class Z. If the respective averages of classes X, Y, and Z are 90, 75, 70, what is the average of the three classes combined?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
If the average of a class of 
students is 
, then the total score for that class is 
. You have 3 classes, so their total scores are 
, 
, and 
. You need to divide the sum of those three numbers by the total number of students in the three classes.
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
RELATED QUESTIONS
if 40% of the students in the class are boys and if there are 15 girls in the class then... (answered by ankor@dixie-net.com,unlockmath)
In youe math class, 60% of the students are girls. If there are 15 girls in the class,... (answered by stanbon)
An introductory psychology class is 40% male. If there are 300 students in the class, how (answered by richwmiller)
There are 40 students in class .three fifth of the students are boys .how many girls
(answered by Alan3354)
In a class of 125 students 20% of the students can dance.2/5th of the total number of... (answered by geetha_rama,lwsshak3)
In a class of 125 students 20 of the students can dance.2/5th of the total number of... (answered by josmiceli)
40% of the students in the class are boys. There are 18 less boys than girls in the... (answered by ewatrrr)
There are 75 students in a classes A and B altogether. There are 61 students in classes A (answered by mananth,greenestamps)
There are 10% more students in the freshman class than in the sophomore class. Combined... (answered by jorel555)
