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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?

7 days
8 days
9 days
10 days

Correct Answer: 9 days

Explanation:

By the fundamental of work and time,
x/45 + (x + 23)/40 = 1
⇒ x = 9 days

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