Mathematics · Time and Work

Pipe A can fill a tank alone in 6 hours, Pipe B can fill it in 9 hours, and Pipe C can empty the full tank in 12 hours. If all three pipes are initially opened and after 1.5 hours, pipe C is discovered to be leaking and immediately closed, and if the magnitude of work done by pipe C during the initial 1.5 hours is x7% of the net work done by all three pipes in that initial 1.5 hours, then the number of factors of x is: