The second number in the given number pairs is obtained by performing certain mathematical operation(s) on the first number. Select the pair in which the numbers are related in the same way as are the numbers of the following pairs. (245, 49), (190, 38)

1. A

   225, 42

2. B

   215, 43

3. C

   170, 36

4. D

   155, 30

Appeared in: DSSSB October 2024

Explanation

• The core concept is identifying a consistent mathematical relationship in given examples and finding an option that follows the same rule.
• In the example pairs (245, 49) and (190, 38), the second number is the result of dividing the first number by 5.
• Calculation for the first pair: 245 / 5 = 49.
• Calculation for the second pair: 190 / 5 = 38.
• The correct option (215, 43) perfectly fits this pattern, as 215 / 5 = 43.

Why Other Options Were Wrong

• Option A: Dividing 225 by 5 results in 45, not 42. Therefore, this pair does not follow the established pattern.
• Option C: Dividing 170 by 5 results in 34, not 36. This pair fails to match the required mathematical relationship.
• Option D: Dividing 155 by 5 results in 31, not 30. This pair does not adhere to the division-by-5 rule.

Related Visual

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Logical Reasoning - Number Analogy as background academic context rather than a clinical decision trigger.
• While this is a general aptitude question, the underlying skill of pattern recognition and accurate calculation is fundamental in nursing.
• Nurses constantly use similar logical reasoning for tasks like calculating drug dosages, titrating IV drips, and interpreting trends in patient vital signs over time.
• For example, recognizing that a patient's blood pressure is consistently dropping by 5 points every hour is a form of pattern recognition that requires immediate action.

How to Approach the Question

• First, carefully examine the two example pairs: (245, 49) and (190, 38).
• Try to determine the mathematical operation that connects the first number to the second. Test basic operations like addition, subtraction, multiplication, and division.
• For (245, 49), notice that 245 is a multiple of 5. Calculate 245 ÷ 5, which equals 49. This is a potential rule.
• Verify this rule with the second pair: 190 ÷ 5 equals 38. The rule (divide the first number by 5) is confirmed.
• Now, apply this rule to each of the four answer choices.
• Select the pair where dividing the first number by 5 gives you the second number.

Concept Tested & Keywords

• Concept Tested: Logical Reasoning - Number Analogy
• Stem keywords: number pairs, mathematical operation, related in the same way
• Lead-in keywords: Select the pair
• Negative lead-in flag: false

Question ID

QXpC9Yo2qYddyvbZK8A7s1

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