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SSC CGL Tier-1 10-06-2019 Shift 1 Solved Paper
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© examsnet.com
Question : 7
Total: 100
The average of 9 numbers is 40. If the average of the first five numbers is 38 and that of the last five is 50, then what is the fifth number?
90
84
78
80
Validate
Solution:
Total sum of all 9 numbers
=
40
×
9
=
360
New,
Sum of first five numbers
=
38
×
5
=
190
and
Sum of last five numbers
=
50
×
5
=
250
∴
Fifth number
=
(
250
+
190
)
−
360
=
440
−
360
=
80
© examsnet.com
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