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UPSC CDS Math Average Questions
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© examsnet.com
Question : 13
Total: 23
The average height of 22 students of a class is 140 cm and the average height of 28 students of another class is 152 cm. What is the average height of students of both the classes ?
[2017 CDS-II]
144.32 cm
145.52 cm
146.72 cm
147.92 cm
Validate
Solution:
Total height of 22 students of a class
=
140
×
22
=
3080
c
m
Total height of 28 students of another class
=
152
×
28
=
4256
c
m
Total height of 50 students of both classes
=
3080
+
4256
=
7336
c
m
Therefore, average height of students of both the classes
=
(
Total height of 50 students of both the classes
)
50
=
7336
50
=
146.72
c
m
© examsnet.com
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