In school assembly, students of a class are standing in a line. Ruhi is 19th from both ends. How many students are present in that class ?

The correct answer is 37.

To find the total number of students standing in the line, we can analyze the position of Ruhi from both ends.

Let's break down the information given in the problem:
1. Ruhi's position from the front (or left end) of the line = 19th.
2. Ruhi's position from the back (or right end) of the line = 19th.

This means:
- There are 18 students standing before Ruhi.
- There are 18 students standing after Ruhi.
- Ruhi herself is 1 student.

To calculate the total number of students in the class, we can use the formula:
Total number of students = (Position from left end) + (Position from right end) - 1

We subtract 1 because Ruhi's position is counted twice (once from the front and once from the back).

$\text{Total students}=19+19-1$

$\text{Total students}=38-1=37$

Therefore, there are 37 students present in that class.