Given data : Sumit is 17th from the last and Ravi is 7 ranks ahead of Sumit. So, Ravi is =17+7=24th (from the last) The total number of students is = 39 Ravi rank from the start = Total number of students - Ravi's rank from the last + 1 = 39 - 24+ 1 = 15 +1 = 16 Ravi's rank from the start is 16th . Hence, '16' is the correct answer.