Supervisor Khan has worked more night shifts in a row than Supervisor Ramesh, who has worked five. Supervisor Malik has worked 15-night shifts in a row, more than Supervisor Khan and Supervisor Ramesh combined. Supervisor Sham has worked eight night shifts in a row, less than Supervisor Khan. How many night Shifts in a row has Supervisor Khan worked?

Appeared in: Haryana CHO - 2022

Explanation

The problem provides several conditions that can be translated into mathematical inequalities.
The first condition states Khan worked more shifts than Sham (8), so K > 8.
The second key condition states Malik (15) worked more shifts than Khan and Ramesh (5) combined, so 15 > K + 5.
Solving the second inequality (15 - 5 > K) reveals that K < 10.
Combining the two conditions (K > 8 and K < 10), the only possible integer value for K is 9.

Option B: If Khan worked 10 shifts, the condition 'Malik has worked more than Khan and Ramesh combined' (15 > 10 + 5, or 15 > 15) would be false, as 15 is not greater than 15.
Option C: If Khan worked 11 shifts, it would violate two conditions: Khan must work fewer than 10 shifts (K < 10) and more than Sham (K > 8). 11 is not less than 10.
Option D: If Khan worked 12 shifts, it would violate the condition that Khan worked fewer than 10 shifts (K < 10).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Logical Reasoning and Inequalities as background academic context rather than a clinical decision trigger.
While not a clinical question, the logical reasoning skills used here are essential in nursing for interpreting patient data and making decisions.
Nurses constantly use 'greater than' and 'less than' logic to evaluate lab results, vital signs, and medication dosages against normal ranges (e.g., is the patient's heart rate greater than 100? Is their blood pressure less than 90/60?).
This skill helps in prioritizing care, identifying changes in a patient's condition, and ensuring patient safety by acting on data that falls outside of expected parameters.

How to Approach the Question

First, read the entire problem to understand the relationships between the individuals.
Assign a variable to each person's number of shifts (e.g., K for Khan, R for Ramesh).
Translate each sentence into a simple mathematical inequality (e.g., 'more than' becomes >, 'less than' becomes <).
Substitute the known numerical values into the inequalities.
Solve and combine the inequalities to establish a narrow range for the unknown value (Khan's shifts).
Identify the only whole number that fits within this final range and select the corresponding option.

Concept Tested & Keywords

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Practise the full Haryana CHO - 2022

Attempt every question from this paper in a timed mock, then review the full solution for each one.