The avg. age of a group of 12 students is 20yers.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: A) 45yr B) 46yr C) 47yr D) 48yr E) 49yr
total age=12*20= 
<gadget id="calculator">12*20</gadget>
<output>240</output>
240   let the sum of age of four new student=x   so the total avg become =(240+x)/16=21   x=196   then the avg age of new student is   196/4= 
<gadget id="calculator">  196/4</gadget>
<output>49</output>
49yr   ANSW49yrR:49yr
<result>E</result>
The avg. age of a group of 12 students is 20yers.If 4 more students join the group,the avg age increases by 1 year.The avg age of the new student is?