A takes twice as much time as B and C takes thrice as much time as B to finish a work. Working together, they can finish the work in 12 days. Find the number of days needed for A to do the work alone. Please give me long and short trick also.
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Answer in the attachment :)!
The writing in pencil is just to make you understand how I did the further steps, they aren't part of the actual answer.
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