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UPSC 2017 CDS II Math Paper
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© examsnet.com
Question : 37
Total: 100
30 men can complete a job in 40 days. However, after 24 days some men out of the assigned 30 left the job. The remaining people took another 40 days to complete the job. The number of men who left the job is
[2017 CDS-II]
24
18
12
6
Validate
Solution:
Let the number of men who left the job after 24 days be n.
Work done by 1 man in 1 day
=
W
30
×
40
=
W
1200
∴
W
1200
×
30
×
24
+
W
1200
×
(
30
−
n
)
×
40
=
W
⇒
30
−
n
30
=
1
−
3
5
=
2
5
⇒
150
−
5
n
=
60
⇒
5
n
=
90
⇒
n
=
18
© examsnet.com
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