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The average weight of 9 students in a seminar is 42 kg. If the weight of 4 facilitators is also included, then the new average weight of each person (facilitator + student) in the seminar becomes 48 kg. Find the average weight of the four facilitators.

A 20.5 kg

B 80.5 kg

C 50.5 kg

D 70.2 kg

E None of these

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