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Aptitude:: Time and Work
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General Questions - Discussion
Exercise
General Questions
Data Sufficiency 1
Data Sufficiency 2
Data Sufficiency 3
Important Formulas
"
X can do a piece of work in 40 days. He works at it for 8 days and then Y finished it in 16 days. How long will they together take to complete the work?
A.
B.
15 days
C.
20 days
D.
26 days
Answer:
Option
A
Explanation:
Work done by X in 8 days =
1
x 8
=
1
.
40
5
Remaining work =
1 -
1
=
4
.
5
5
Now,
4
work is done by Y in 16 days.
5
Whole work will be done by Y in
16 x
5
= 20 days.
4
X's 1 day's work =
1
, Y's 1 day's work =
1
.
40
20
(X + Y)'s 1 day's work =
1
+
1
=
3
.
40
20
40
Hence, X and Y will together complete the work in
40
= 13
1
days.
3
3
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