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UPSC CDS Math Average Questions
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© examsnet.com
Question : 22
Total: 23
If the average of
A
and
B
is 30 , the average of
C
and
D
is 20 , then which of the following is/are correct?
I. The average of
B
and
C
must be greater than 25 .
II. The average of
A
and
D
must be less than
25
.
Select the correct answer using the codes given below
[CDS-I 2014]
Only I
Only II
Either I or II
Neither I nor II
Validate
Solution:
Average of
A
and
B
=
30
A
+
B
2
=
30
⇒
A
+
B
=
60
and average of
C
and
D
=
20
⇒
C
+
D
2
=
20
⇒
C
+
D
=
40
Since, the individual values of
A
,
B
,
C
and
D
are not specified.
Hence, average of
B
and
C
can be greater or less than 25 and average of
A
and
D
can be greater or less than
25
.
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