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RRB Junior Engineer Stage 1 Model Papers 1
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© examsnet.com
Question : 13
Total: 100
A, B and C together can do a piece of work in 40 days. After working with B and C for 16 days, A leaves and then B and C complete the remaining work in 40 days more. A alone could do the work in
80 days
90 days
100 days
120 days
Validate
Solution:
(
A
+
B
+
C
)
's 1 day's work
=
(
1
40
)
t
h
part of whole work
(
A
+
B
+
C
)
's 16 days work
=
16
40
=
2
5
of whole work
(
B
+
C
)
completes remaining work in 40 days
(
B
+
C
)
completes
(
3
5
)
t
h
part of work in 40 days.
(
B
+
C
)
completes whole work in
40
×
5
3
=
200
3
days
1
A
+
1
B
+
1
C
=
1
40
1
A
+
3
200
=
1
40
1
A
=
1
40
−
3
200
=
5
−
3
200
=
2
200
1
A
=
1
1000
A alone can complete whole work in 100 days
© examsnet.com
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