A can do a piece of work in 40 days. He worked at it
for 5 days, then B finished it in 21 days. The number
of days that A and B take together to finish the work
ane
(A) 15 days
(B) 14 days
(C) 13 days
(D) 10 days
Answers
Answered by
1
Answer:
A can do a piece of work in 40 days
Work of A in 1 day=1/40
Work of A in 5 days=5/40=1/8
1/8th part of work is done by A
Remaining work=(1−
8
1
)=
8
7
7/8th part is done by B in 21 days
Total work will be done by B in =
8
7
21
=
7
21
×8=24days
Work done by B in one day=1/24
Work done by A and B together in one day will be(
40
1
+
24
1
)
(
120
3+5
)=
120
8
=
15
1
A and B will take 15 days to complete the work together.
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