The average age of group of 24 students is 15 year. If a student aged 9 years leaves the group, what will be the new average age?

The average age of group of 24 students is 15 year. If a student aged 9 years leaves the group, what will be the new average age?
24 छात्रों के एक समूह की औसत आयु 15 वर्ष हैं। यदि 9 वर्ष की आयु का एक छात्र समूह छोड़ देता है, तो नई औसत आयु क्या होगी?

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