- A42
- B43
- C40
- D45
Step-by-Step Solution
Students' total = 360; new average 13 over 31 people = 403; teacher's age = 403 − 360 = 43.
Answer: B) 43
The average age of 30 students is 12 years. When the teacher's age is included, the average increases by 1 year. What is the teacher's age?
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