Madhu ranks eleventh in a class of 29 students. What is her rank from the last?​​

Given: 

Madhu ranks eleventh in a class of 29 students.

​Formula:​

​Solution: ​

29 = 11 + last - 1  

Last = 30 - 11

Last = 19

19 is her rank from the last.

Thus, correct option is (b).