Manoj and Sachin are ranked seventh and eleventh respectively from the top in a class of 31 students. What will be their respectively rank from the bottom in the class?

25th and 21st

According to the question:

Manoj is 7th and Sachin is 11th from the top in a class of 31 students. Thus, there ranks from bottom of the class will be as follows:

Manoj - 31 + 1 - 7 = 25th

Sachin - 31 + 1 - 11 = 21st