A and B can do a job in 15 days and 10 days, respectively. They began the work together but A leaves after some days and B finished the remaining job in 5 days. After how many days did A leave?
(a) 2 days
(b) 3 days
(c) 1 days
(d) 4 days
(e) 8 days
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the answer is on day
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