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Question
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?
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Answer
x/42+(x-3)/84+(x-5)/28=1:
2x+x-3+3x-15=84:
6x-18=84:
6x=102:
x=17
