The average age of 25 students in a class is 12years. If teacher's age is also included then average increases 1year then find the teacher's age?  Pick one: A) 40 B) 35 C) 29 D) 38 E) 42
Total age of 25 students = 25*12= 
<gadget id="calculator">25*12</gadget>
<output>300</output>
300   Total age of 26 persons= 26*13= 
<gadget id="calculator">26*13</gadget>
<output>338</output>
338   Age of teacher= 338-300= 
<gadget id="calculator">338-300</gadget>
<output>38</output>
38years   Answer is 38
<result>D</result>
The average age of 25 students in a class is 12years. If teacher's age is also included then average increases 1year then find the teacher's age?