In a row of students, if John, who is 16th from the left, and Johnson, who is 8th from the right, interchange their positions, John becomes 33rd from left. How many students are there in the row?

According to question,we have John's position = 16th from the left Johnson's position = 8th from the right After interchanging their positions , John's position = 33rd from left ∴ Total number of students = John's position + Johnson's position - 1 Total number of students = 33 + 8 – 1 = 40