The average of 30 boys in a class is 15 years. One boy aged 20 years, left the class, but two new boys came in his place the difference of whose ages was 5 years. If the average age of all the boys now in the class still remains 15 years, the age of the younger newcomer is
The average of 30 boys in a class is 15 years. One boy aged 20 years, left the class, but two new boys came in his place the difference of whose ages was 5 years. If the average age of all the boys now in the class still remains 15 years, the age of the younger newcomer is
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