Average age of students of an adult school is 52 years. 120 new students whose average age is 32 years joined the school. As a result the average age is decreased by 4 years. Find the number of students of the school after joining of the new students.  Choose the correct choice from the following answers:  A) 1200  B) 150  C) 360  D) 240  E) None of these
Explanation :   Let the original no. of students be x.   According to situation, 52x + 120*32 = (x + 120)36 ⇒ x = 30   So, Required no. of students after joining the new students   = x + 120 = 150   Answer : 150
<result>B</result>
Average age of students of an adult school is 52 years. 120 new students whose average age is 32 years joined the school. As a result the average age is decreased by 4 years. Find the number of students of the school after joining of the new students.