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A and B can do a piece of work in 20 days and 12 days respectively. A started the work alone and th
A और B क्रमशः 20 दिनों और 12 दिनों में एक काम कर सकते हैं। A ने अकेले काम शुरू किया और फिर 4 दिन बाद B ने काम पूरा होने तक उसे ज्वाइन कर लिया। काम कब तक चला?
A- 6 दिन
B- 10 दिन
C- 15 दिन
D- 20 दिन
A and B can do a piece of work in 20 days and 12 days respectively. A started the work alone and then after 4 days B joined him till the work was completed. How long did the work last?
A- 6 days
B- 10 days
C- 15 days
D- 20 days
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