The average age of 24 students and the class teacher is 16 years. If the class teachers’ age is excluded, the average reduces by 1 year. What is the age of the class teacher?
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Answer:
x/25=16
x=400
let y be teachers age
400-y/24=15
400-y=24*15
400-y=360
400-360=y
y=40 years old
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