the average age of 40 students of a class is 18 years. when 20 new student are admitted to the same class, the average age of the students of the class is increase by 6 months. the average age of newly admitted students is
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average=sum of age / no. of students
sum=avg.*no. of students
sum=40*18=720
New no.of students=20; total=60
20 students sum of age=y
(720+y)/60= 37/2
720+y= 37*30
y=1110-720
y=390
average of 20 students= sum of 20/20
390/20=19.5 years
sum=avg.*no. of students
sum=40*18=720
New no.of students=20; total=60
20 students sum of age=y
(720+y)/60= 37/2
720+y= 37*30
y=1110-720
y=390
average of 20 students= sum of 20/20
390/20=19.5 years
Hmingthanglien:
how is 37/2 come out
6month increase so to convert into year 18+(6/12)
thank you
welcome
how is 19.5 years turn into 19 years 6 month
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