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The average age of 30 students is 9 years. If the age of their teacher is included, the average age become 10 years. The age of the teacher ( in years ) is
5Q:
The average age of 30 students is 9 years. If the age of their teacher is included, the average age become 10 years. The age of the teacher ( in years ) is
- 134 yearsfalse
- 236 yearsfalse
- 337 yearsfalse
- 440 yearstrue
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