The avg. age of a group of 28 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 most appropriate option.
A) 22 years  B) 23 years  C) 24 years  D) 25 years  E) 28 years
Total age of 28 students=28*20= 
<gadget id="calculator">28*20</gadget>
<output>560</output>
560   If total age of 4 students=x   Then, (560+x)/(28+4) =(20+1), x=112   So average age of new students=112/4= 
<gadget id="calculator">112/4</gadget>
<output>28</output>
28 years   ANSW28 yearsR:28 years
<result>E</result>
The avg. age of a group of 28 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?