Average age of 5 teachers is 42 years. Retired 8 teachers average age is 81 years. What is the average of all teachers?
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Answer:
average of all teacher= 868
Step-by-step explanation:
average= sum of age of 5 teacher / total no of teacher
42 = sum of age of 5 teacher/ 5
42×5 = sum of 5 teacher
220 = sum of 5 teacher
averaje = sum of age of 8 teacher / total of teacher
81 ×8 = sum of age of 8 teacher
648 = sum of age of 8 teacher
average of all teacher = sum of all 13 teacher/ 13
= 220+648×13
=868×13
=11284
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