74. The average age of a class of 27 students is 10 years. If the teacher's age is included, the average is increased by 1. What is the age of the teacher?
[A] 35
[B] 36
[C] 38
[D] 37
Answer : C
Explanation :
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27 nos x 10 years = 270 years
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...(1)
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28 nos x 11 years = 308 years
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...(2)
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Teacher's age = (2) - (1) = 308 - 270 = 38 years.
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