Question

1. A and B can do a piece of work in 25 days and 35
days. Both starts the work together for some time,
but B leaves the job 7 days before the work is
completed. Find the time in which work is finished.
1
(a) 17days
(b) 173 days
(c) 18 days
(d) 20 days​

Answer 1

Step-by-step explanation:

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