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CDS Model Paper 2 Mathematics
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© examsnet.com
Question : 13
Total: 100
5 persons working eight hours daily can complete a wall in 10 days. When they have worked for
5
frac
1
2
days, 5 more persons are brought to the work. The wall can now be completed in :
one more day
two more days
three more days
four more days
Validate
Solution:
5 person's one day work
=
1
10
5 person's
5
1
2
day's job
=
11
2
×
1
10
=
11
20
Remaining work to be completed
=
1
−
11
20
=
9
20
...(i)
Now, one person's one day's work
=
1
10
×
5
=
1
50
⇒ Ten person's one day's work
=
10
×
1
50
=
1
5
...(ii)
From (i) and (ii), the no. of more days required
=
9
20
1
5
=
9
×
5
20
=
2.25
=
3
days
© examsnet.com
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