the average age of 30 kids is 9 years. if the teacher’s age is included, the average age becomes 10 years. what is the teacher’s age?
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Average age of 30 kids = 9
total = 30*9 = 270
average age of 30 + 1 = 31 = 10
total = 31*10 = 310
Age of Teacher = 310 - 270
= 40
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