There are 24 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. Answers:
A) 1 year  B) 1 years 2 months  C) 2 years 5 months  D) 4 years  E) None
Total decrease = 24 * 2= 
<gadget id="calculator">24 * 2</gadget>
<output>48</output>
48 months= 4 years   4 years
<result>D</result>
There are 24 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.