Portions of Advanced Certification

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Of the 600 professionals who took an advanced certification examination, 50 percent passed the written portion of the exam, 30 percent passed the simulation portion of the exam, and 65 percent passed the demonstration portion of the exam. If 20 percent of the examinees passed no portion of the exam, and 35 percent of the subjects passed exactly two portions of the exam, how many of the subjects passed exactly one portion of the exam?