In the following number-pairs, the second number is obtained by applying certain mathematical operations to the first number. Select the pair in which the numbers are related in the same way as are the numbers of the following pairs.

(Note: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

25, 125
60, 300

Appeared in: RRB Nsg Superintendent -29 April 2025 (Shift-1st)

Explanation

The core concept is identifying a consistent mathematical relationship in given examples and finding an option that follows the same pattern.
In the given pairs (25, 125) and (60, 300), the second number is obtained by multiplying the first number by 5.
Calculation for the first pair: 25 × 5 = 125.
Calculation for the second pair: 60 × 5 = 300.
The correct option (45, 225) also follows this rule: 45 × 5 = 225.

Option A: The relationship is multiplication by 12 (50 × 12 = 600), not by 5.
Option B: The relationship is multiplication by 10 (75 × 10 = 750), not by 5.
Option D: The relationship is multiplication by 3 (20 × 3 = 60), not by 5.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Number Analogy as background academic context rather than a clinical decision trigger.
This question tests logical reasoning and pattern recognition, skills that are useful in non-clinical sections of nursing entrance exams.
While not directly clinical, the ability to perform quick mental calculations is beneficial for tasks like medication dosage calculations.
What if the pairs were (25, 50) and (60, 120)? The rule would be to multiply by 2. In that case, an option like (45, 90) would be correct.

How to Approach the Question

First, analyze the relationship between the numbers in the first given pair (25, 125). Consider basic operations: addition, subtraction, multiplication, division.
Next, verify if the same relationship holds true for the second given pair (60, 300). This confirms the pattern.
In this case, you find that 125 is 5 times 25, and 300 is 5 times 60. The rule is to multiply the first number by 5.
Systematically apply this rule (multiply by 5) to the first number of each of the four options.
Compare the result of your calculation with the second number in the option pair.
The option where your calculated result matches the second number is the correct answer.

Concept Tested & Keywords

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Practise the full RRB Nsg Superintendent -29 April 2025 (Shift-1st)

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