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The average age of 30 students in a class is 14 years. When the teacher's age is added, the average becomes 15 years. Find the teacher's age (in years).

Competition practiceAverages & Ages
  • A45
  • B46
  • C40
  • D44

Step-by-Step Solution

Students' total = ; with the teacher, total = , so the teacher's age is 465 − 420 = 45.
Answer: A) 45

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