In a row of 83 students facing north, Ravi is 24th from the left end. If a steward is 17th to the right of Ravi, what is the position of the steward from the right end of the row?

1. A

   43rd

2. B

   42nd

3. C

   40th

4. D

   45th

Appeared in: DSSSB October 2024

Explanation

• First, determine the steward's position from the left end. Since Ravi is 24th from the left and the steward is 17 places to his right, the steward's position is 24 + 17 = 41st from the left.
• Next, to find the position from the right end, subtract the left-end position from the total number of students and add 1.
• The formula is: Position from Right = (Total Students - Position from Left) + 1.
• Applying the values: (83 - 41) + 1 = 42 + 1 = 43rd.
• The '+1' is crucial because subtracting the position from the total only gives the number of students to the right of that person; adding 1 includes the person themselves in the count from the right.

Why Other Options Were Wrong

• Option B: This result (42nd) is obtained by incorrectly calculating (83 - 41) and forgetting to add 1. This common error fails to account for the person's own position when counting from the opposite end.
• Option C: This is a calculation error. It does not correspond to a logical step in the problem. It might arise from incorrectly determining the steward's position from the left, for instance, by subtracting instead of adding (e.g., 24-17=7, then 83-7+1=77) or other miscalculations.
• Option D: This is a calculation error. It could result from an arithmetic mistake, such as (83 - 41) + 3 or miscalculating the steward's initial position from the left.

Related Visual

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain This question tests the concept of Ranking and Order, a common topic in logical reasoning as background academic context rather than a clinical decision trigger.
• This type of logical reasoning assesses attention to detail, understanding of spatial relationships, and the ability to perform multi-step calculations accurately.
• The core skill is translating a descriptive word problem into a clear sequence of mathematical operations.
• This skill is fundamental for standardized tests required for many professional courses, including nursing, as it demonstrates critical thinking and problem-solving abilities.

How to Approach the Question

• First, carefully read the problem and identify all the key numbers and relationships: total students (83), Ravi's position from the left (24th), and the steward's position relative to Ravi (17th to the right).
• Visualize the row of students. This helps in understanding the directions 'left' and 'right'.
• Calculate the steward's absolute position from one end. Since Ravi's position is given from the left, calculate the steward's position from the left as well: 24 + 17 = 41st.
• Identify the final question: What is the steward's position from the right end?
• Recall or apply the standard formula for converting positions: Position from Opposite End = (Total - Position from Known End) + 1.
• Substitute the values into the formula and solve: (83 - 41) + 1 = 43. This gives you the final answer.

Concept Tested & Keywords

• Concept Tested: This question tests the concept of Ranking and Order, a common topic in logical reasoning.
• Stem keywords: row, students, north, left end, right, right end
• Lead-in keywords: what is the position

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Q7Tkcc5iwVzqTi9MOBSuEP

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