There are 30 girls in hostel whose average age is decreased by 2 months, when one girl 18 yrs is replaced by a new boy.Find the age of new girl.	Choose the correct choice from the following:
A) 1 year
B) 1 year 2 months
C) 2 years 5 months
D) 5 years
E) None
Total decrease =30 * 2= 
<gadget id="calculator">30 * 2</gadget>
<output>60</output>
60 month= 5 years   5 years
<result>D</result>
There are 30 girls in hostel whose average age is decreased by 2 months, when one girl 18 yrs is replaced by a new boy.Find the age of new girl.