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UPSC 2013 CDS 2 Math Paper
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© examsnet.com
Question : 6
Total: 100
A can do a piece of work in 4 days and B can complete the same work in 12 days. What is the number of days required to do the same work together?
[2013 CDS-II]
2
3
4
5
Validate
Solution:
In one day, A can do
1
4
of the work and B can do
1
12
of the work. Together they can do
1
4
+
1
12
=
3
+
1
12
=
4
12
=
1
3
of the work in one day
So, they can together complete the work in 3 days
© examsnet.com
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