The average age of 20 students in a class is 5years. If teacher's age is also included then average increases 1year then find the teacher's age?	Options
A) 28 B) 24 C) 20 D) 22 E) 18
Total age of 50 students = 20*5= 
<gadget id="calculator">20*5</gadget>
<output>100</output>
100   Total age of 51 persons= 20*6= 
<gadget id="calculator">20*6</gadget>
<output>120</output>
120   Age of teacher= 120-100= 
<gadget id="calculator">120-100</gadget>
<output>20</output>
20years   Answer is 20
<result>C</result>
The average age of 20 students in a class is 5years. If teacher's age is also included then average increases 1year then find the teacher's age?