The bar graph below gives the strength of 'section A' consecutively for 6 years since 2009 when it was Class 6, Sec. A. Each year, same students get promoted to next class. Also, some of the students get new admission and some of the students get transferred. So, the number of students varies accordingly.
How many students got admitted to the class at the start of session 2012 if nobody from the previous year batch took a transfer and 2 students were not promoted?
7
Number of students in the class in session 2011; Class 8 Sec. A = 40
If nobody took transfer and 2 students were not promoted, number of old students = 40 - 2 = 38
Number of students in the class in Session 2012; Class 9 Sec. A = 45
Number of new students = 45 - 38 = 7 students.