A and B can do a piece of work in 15 and 25 days respectively . They worked for some time and then B left the work 7 days before the work is completed . What is the total time taken ? (in days)
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Answer:
Supose A left after x days Then Work of (A + B) for x days =
28
x
+
35
x
Work of B for 17 days =
35
17
∴
28
x
+
35
x
+
35
17
=1⇒
140
5x+4x
=1−
35
17
=
35
18
⇒
140
9x
=
35
18
⇒x=
35×9
18×140
=8 days please mark me as brainleast answr
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