The avg. age of a group of 16 students is 20 years.If 4 more students join the group,the avg age increases by 1 year.The avg age of the new student is?	Choose the correct choice from the following answers.
A) 22 years B) 23 years C) 24 years D) 25 years E) 26 years
Total age of 16 students=16*20= 
<gadget id="calculator">16*20</gadget>
<output>320</output>
320   If total age of 4 students=x   Then, (320+x)/(16+4) =(20+1), x=100   So average age of new students=100/4= 
<gadget id="calculator">100/4</gadget>
<output>25</output>
25 years   ANSWER:25 years
<result>D</result>
The avg. age of a group of 16 students is 20 years.If 4 more students join the group,the avg age increases by 1 year.The avg age of the new student is?