1.
|
A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :
|
|
|
Answer: Option D
Explanation:
A's 1 day's work =
|
1
|
;
|
15
|
B's 1 day's work =
|
1
|
;
|
20
|
(A + B)'s 1 day's work =
|
|
1
|
+
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1
|
|
=
|
7
|
.
|
15
|
20
|
60
|
(A + B)'s 4 day's work =
|
|
7
|
x 4
|
|
=
|
7
|
.
|
60
|
15
|
Therefore, Remaining work =
|
|
1 -
|
7
|
|
=
|
8
|
.
|
15
|
15
|
Title : Time And Work Q1
Description : 1. A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is ...
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