Discussion
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 ?
Answer: B
There are 37 students in the class.
Ruhi is 19th from one end, so 18 students stand before her on that side. She is also 19th from the other end, so 18 students stand on that side too.
\[ \text{Total} = 18 + 1 + 18 = 37 \]
The usual shortcut is (position from the left) + (position from the right) - 1 = 19 + 19 - 1 = 37. The answer 38 is what you get by forgetting to subtract 1, so Ruhi is counted twice; 36 subtracts her as well; 40 has no basis.
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