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UPSC CDS 2 2021 Math Paper
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© examsnet.com
Question : 21
Total: 100
20 men are supposed to complete a work in 10 days after working for 5 days they realise that only one fourth of the work is done. How many more men they need to employ to finish the work on time?
40
30
20
15
Validate
Solution:
👈: Video Solution
Here,
M
1
=
20
D
1
=
5
⇒
W
1
=
1
4
Let
x
more men are employeed.
∴
M
2
=
20
+
x
D
2
=
5
W
2
=
1
−
(
1
4
)
=
3
4
We know that,
M
1
D
1
W
1
=
M
2
D
2
W
2
⇒
M
1
D
1
W
2
=
M
2
D
2
W
1
⇒
20
×
5
×
3
4
=
(
20
+
x
)
×
5
×
1
4
⇒
20
×
3
=
(
20
+
x
)
⇒
60
=
20
+
x
⇒
x
=
40
Hence, 40 more men need to be employed to finish the work on time.
© examsnet.com
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