yazmin2146 yazmin2146

11-03-2024
Mathematics

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The average age of 10 students and their teacher is 15 years. The average age of the first seven students is 15 yr and that of the last three is 11 yr. What is the teacher's age?
a) 33 years
b) 30 years
c) 27 years
d) 24 years
e) 25 years

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