The average age of a class of 30 students is 15.2 years. If 15 more boys joined the class, the average age of the class is decreased by half year. What is the average age of new boys?
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The average age of a class of 30 students is 15.2 years. If 15 more boys joined the class, the average age of the class is decreased by half year. What is the average age of new boys?