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 in the line, we can use the position of Ruhi from both ends.

Ruhi is 19th from the front (left end), which means there are 18 students standing before her.

Ruhi is also 19th from the back (right end), which means there are 18 students standing behind her.

To calculate the total number of students, we add the students in front of Ruhi, the students behind Ruhi, and count Ruhi herself:

$\text{Total students}=18+18+1=37$

Alternatively, using the standard formula for total count given position from both ends:

$\text{Total students}=(\text{Position from left}+\text{Position from right})-1$

$\text{Total students}=(19+19)-1=38-1=37$

Therefore, there are 37 students present in the class.