Answer:

20th

hope this helped..

Answer: 20th

Step-by-step explanation:

Given that there are 39 students in the class.

Ravi is 7 ranks ahead of Samit or Samit is 7 ranks behind Ravi.

Samit's rank is 27.

From question it may be analyzed that

Samit's rank - Ravi's rank = 7

Let Ravi's rank = X

Therefore, Samit's rank - X = 7

27 - X = 7

X = 27 - 7 = 20

Hence, Ravi's rank = 20th.