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A , B and C can finish a task in 42 days...

A , B and C can finish a task in 42 days, 84 days and 28 days, respectively. A started the work. B joined him after 3 days. If C joined them after 5 days from the beginning, then for how many days did A work till the completion of the task?
A, B और C किसी कार्य को क्रमशः 42 दिन, 84 दिन और 28 दिन में कर सकते हैं | A ने कार्य शुरू किया तथा 8 3 दिन बाद उसमें शामिल हुआ | यदि C ने आरम्भ से 5 दिनों के बाद कार्य करना शुरू किया, तो A कार्य पूरा होने तक कितने दिनों तक कार्य करता रहा ?

A

20

B

15

C

17

D

18

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