(c) $N_{1}V_{1} + N_{2}V_{2} = N_{3}V_{3}$ $0.3 \times 100 + 0.6 \times 200 = N_{3} \times 300$ $0.3 + 1.2 = 3N_{3}$ $N_{3} = 0.5$
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Ph.D. in Physics with 19+ years of teaching experience.