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AFCAT I 2015 Solved Paper
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© examsnet.com
Question : 30
Total: 100
Choose the most appropriate answer :
A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?
12 days
15 days
16 days
18 days
Validate
Solution:
Work done by A in 2 days =
1
20
×
2
=
1
10
Work done by A, B and C in one day =
1
20
+
1
30
+
1
60
=
3
+
2
+
1
60
=
6
60
=
1
10
Work done in three days (When A is assisted by B andC on every third day) =
1
10
+
1
10
=
2
20
=
1
5
Hence required number of days = 5 × 3 = 15 days
© examsnet.com
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