The average age of 14 girls and their teacher's age is 15 yr. If teacher's age is excluded then the average reduced by 1. What is the teacher's age?

29 yr
35 yr
32 yr
30 yr

Correct Answer: 29 yr

Explanation:

Sum of 14 girls and teacher age = 15 x 15 = 225
Without teacher's age sum of 14 girls age = 14 x 14 = 196
∴ Teacher's age = 225 -196 = 29 year

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