Question

In a group of 800 participants planning a community event, some opted for the role of organizers in a Science Fair, while others chose to organize a Talent Show, with an initial ratio of 6:11, respectively. Some participants were initially undecided. As the event planning progressed, all participants took on roles, and the distribution between the Science Fair and Talent Show became 13:19, respectively. The undecided participants then divided themselves between the Science Fair and Talent Show in a 7:8 ratio. How many participants were initially undecided about their roles in the event?

A 400
B 355
C 375
D 325
E none of these
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