The average age of 36 students in a group is 18 years. When teacher's age is included to it, the average increases by one. What is the teacher's age in years ?  Choose the correct answer.
A) 35 years	B) 55 years	C) 51 years	D) 54 years	E) None of these
Explanation:   Age of the teacher = (37 * 19 - 36 * 18)= 
<gadget id="calculator">(37 * 19 - 36 * 18)</gadget>
<output>55</output>
55 years. Answer: 55 years
<result>B</result>
The average age of 36 students in a group is 18 years. When teacher's age is included to it, the average increases by one. What is the teacher's age in years ?