By how much is 60% of 50 greater than 40% of 25?

Appeared in: DSSSB 12 August 2024

Explanation

The first part of the calculation is to find 60% of 50. This is calculated as (60/100) * 50, which equals 30.
The second part is to find 40% of 25. This is calculated as (40/100) * 25, which equals 10.
The question asks by how much the first value is greater than the second, which requires finding the difference between the two results.
Subtracting the second value from the first gives the final answer: 30 - 10 = 20.

Option A: This is an incorrect result. It may arise from a calculation error during one of the steps.
Option B: This is an incorrect result. It may arise from a calculation error during one of the steps.
Option C: This is an incorrect result. It may arise from a calculation error during one of the steps.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Calculation of percentages and finding the difference between two values as background academic context rather than a clinical decision trigger.
While this is a general aptitude question, strong basic math skills are critical for safe and effective nursing practice.
Nurses frequently use percentage calculations for medication dosages, determining the concentration of solutions, and calculating IV drip rates.
Accurate math prevents medication errors, which are a major patient safety concern.

How to Approach the Question

First, break down the question into two separate calculations: finding '60% of 50' and '40% of 25'.
To calculate a percentage of a number, convert the percentage to a decimal or fraction and multiply. For example, 60% is 0.60 or 60/100.
Calculate the first value: 0.60 × 50 = 30.
Calculate the second value: 0.40 × 25 = 10.
The phrase 'by how much is... greater than...' indicates you need to find the difference by subtracting the smaller value from the larger one.
Perform the final subtraction: 30 - 10 = 20.

Concept Tested & Keywords

Concept Tested: Calculation of percentages and finding the difference between two values.
Stem keywords: 60% of 50, 40% of 25, greater than, difference
Lead-in keywords: By how much

QZwfvVBegGT2lh6BDImsCh

Practise the full DSSSB 12 August 2024

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