The average age of a class was 15 years, when 5 boys whose average age was 12 years 6 months were admitted average of the class was reduced by 6 months. How many boys were there ? एक कक्षा की औसत आयु 15 वर्ष थी, जब 5 लड़के जिनकी औसत आयु 12 वर्ष 6 माह थी, शामिल किये जाते हैं, कक्षा का औसत 6 माह घट जाता है। वहां कक्षा में कितने लड़के थे?
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