There are 20 girls inhostel 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 one
A) 1 year	B) 1 year 2 months	C) 2 year 5 months	D) 3 year	E) None
Total decrease = 20 * 2= 
<gadget id="calculator">20 * 2</gadget>
<output>40</output>
40 month= 3 years 4 month   None)None
<result>E</result>
There are 20 girls inhostel 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.