Mathematics · Time and Work
A, B and C can alone paint a room in 40 hours, 60 hours and 80 hours respectively. If A, B and C together painted the wall for 10 hours, then A left. B and C together painted for 4 hours, and then B left. Then A returned, and A and C together painted for 8 hours. What part of the wall is still left to be painted?
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