6. The average age of 15 students is 11 yr 3 months which increased by 1 1 yr and 1-months when the age 2 of teacher is included, find the age of teacher in years and months. [June 2013]
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Average age of 15 Students = 11 years + 3 months = 11 * 12 + 3 = 135 Months. → Total age of 15 Students = 15 * 135 = 2025 Month
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