To find the fraction of all campers at Rosewood Performing Arts Camp who play guitar, we can follow these steps:
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Let’s denote the total number of campers as \( C \).
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According to the problem, \( \frac{1}{3} \) of these campers play an instrument. So the number of campers who play an instrument is: \[ \frac{1}{3}C \]
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Out of those campers who play an instrument, \( \frac{2}{5} \) play guitar. Therefore, the number of campers who play guitar is: \[ \frac{2}{5} \times \frac{1}{3}C = \frac{2}{15}C \]
Thus, the fraction of all campers at Rosewood Performing Arts Camp who play the guitar is \( \frac{2}{15} \).