Mr. Raqi conducted an art workshop during the school holidays. On Monday, all the children were present. On Tuesday, 2/3 of the children were present. On Wednesday, the number of children had decreased by half compared to Tuesday; and on Thursday only 3/4 of the children who were on the previous day came for the lesson. On Friday, only 6 children were present, which was 2/3 of the number of pupils present on Thursday. How many children signed up for the class?

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