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A and B can do a piece of work in 45 days and 40 days, respectively. They began to do the work together but A left after some days and then B completed the remaining work in 23 days. The number of days after which A left the work, is ?
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- 7 days
- 8 days
- 9 days
- 10 days
Correct Option: C
By the fundamental of work and time,
x/45 + (x + 23)/40 = 1
⇒ x = 9 days
