The average of the marks of 28
students in Mathematics was
50. When 8 students left the
school, then the average in-
creased by 5. What is the av-
erage of the marks obtained by
the students who left the
school?
Answers
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Step-by-step explanation:
Total marks of 28 students in Mathematics = 28 x 50 = 1400
New number of students = 28 - 8 = 20
New average of marks in Mathematics = 50 + 5 = 55
∴ Total marks of 20 students in Mathematics = 20 x 55 = 1100
∴ Total marks of 8 students who left the school = 1400 - 1100 = 300
∴ Average marks of these 8 students =
8
300
= 37.5
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