| The average age of a class of 15 students is 10 yr. If the age of teacher is also included, then the average increases by 1 yr. Find the age of teacher. |
A) 25 yr
B) 26 yr
C) 27 yr
D) 28 yr
Correct Answer: B
Solution :
| Sum of age of 15 students \[=15\times 10=150\,yr\] |
| Average age of 16 people \[=16\times 11=176\,yr\] |
| Age of teacher \[=176-150=26\,yr\] |
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