15. A and B can do a piece of
work in 15 days and 20 days
respectively. Find the number
of days that B will take to
complete remaining work,if A
2 po
worked for 3 days and left."
O 50
O 10
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Answer:
ANSWER
Given A can do the work in 20 days and B can do it 15 days.
Then work done by A in one day =
20
1
And, work by B in one day =
15
1
Then, the work done by A & B in one day =
20
1
+
15
1
=
60
7
A & B done 6 days together then work done in A & B in 6 days =
60
7
×6=
10
7
Then friction of work left =1−
10
7
=
10
3
Then B can do
10
3
work =
10
3
×
1
15
=
2
9
=4
2
1
days.
Step-by-step explanation:
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