Mathematics · Time and Work
A alone can build a wall in 36 days, B alone can build it in 60 days, while C can completely destroy the built wall in 72 days. A works alone on the 1st, 4th, 7th,... day; B works alone on the 2nd, 5th, 8th,... day; and C works alone on the 3rd, 6th, 9th,... day. This cycle continues until the wall is completely built, after which C can no longer destroy any part of it. In how many days will the entire work be completed?
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