The average of a group of students is reduced by 2 years when two boys aged 20 years and 22 years leave the group. If the average age of the group was intially 15. Years
Answers
Answer:
Total number of students is 3
Step-by-step explanation:
Let the number of students be X.
Initial average age of the students = 15
Actual average age of the students = 13.
As per question,
15X= (X-2) ×12+20+22
15X = 12X-24+20+22
3X =18
X=3.
There were 8 Boys in the group initially if average age of 15 reduced by2 years when two boys aged 20 & 22 Years left the group
Step-by-step explanation:
Let say There were N boys in Group
Average age = 15 years
Total Age = 15N
The average of a group of students is reduced by 2 years when two boys aged 20 years and 22 years leave the group
=> New Average = 15 -2 = 13 Years
Boys = N - 2
Total ages = 13(N - 2) = 13N - 26
13N - 26 = 15N - 20 - 22
=> 2N = 16
=> N = 8
There were 8 Boys in the group initially
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