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SSC CGL Tier-1 23-Aug-2021 Shift 2 Solved Paper
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© examsnet.com
Question : 24
Total: 100
The average age of 17 persons is
39
y
r
. If the average age of the first 9 persons is
35
y
r
and the average age of the last 9 persons is
44
y
r
, what is the age of the 9 th person?
48
y
r
45
y
r
41
y
r
36
y
r
Validate
Solution:
Given, average age of 17 persons is
39
y
r
.
Total age of 17 persons
=
39
×
17
=
663
y
r
]
[
∵
Average
=
Sum of terms
Total terms
]
.
Total age of 9 person
=
35
×
9
=
315
y
r
Total age of remaining 9 persons
=
44
×
9
=
396
y
r
∴
Age of 9 th persons
=
(
315
+
396
)
−
663
y
r
=
711
−
663
=
48
y
r
© examsnet.com
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