Read the following passage and answer the question.
The following table – 1 shows the percentage (%) distribution of patients of various diseases in the various continents, namely, Europe, Australia, South America, Africa, North America and Asia in the world and table II shows the percentage (%) distribution of all the patients and Kidney patients in year 2023. Total population of the world in the year 2023 is 800 crore and 10% of them are patients.
Based on the data in the tables, answer the questions that follow.
Table – I: Disease – wise Percentage of Patients in the world
| Heart Disease |
AIDS |
TB |
Hepatitis |
Kidney Disease |
Others |
| 22% | 10% | 8% | 6% | 30% | 24% |
Table -II: Continent – wise Details of all Patients and Kidney Patients
| Continent |
Percentage Distribution of |
|
| All Patients |
Kidney Patients |
|
| Europe |
10% | 10% |
| Australia |
6% | 5% |
| South America |
15% | 40% |
| Africa |
25% | 10% |
| North America |
12% | 15% |
| Asia |
32% | 20% |
If the number of Kidney patients in South America decreases by 25%, then what is the percentage decrease in the number of Kidney patients in the world?
Correct Answer :
8%
Solution :
The correct option is 8%.
To understand why this is the correct answer, let's break down the step-by-step analysis of the data provided in the tables:
Step 1: Identify the proportion of Kidney patients in South America
From Table - II (Continent-wise Details of all Patients and Kidney Patients), we can find the percentage distribution of Kidney Patients for each continent:
- Europe: 10%
- Australia: 5%
- South America: 40%
- Africa: 10%
- North America: 15%
- Asia: 20%
Thus, the kidney patients in South America constitute 40% of the total kidney patients in the world.
Step 2: Calculate the percentage decrease in the world's Kidney patients
Let the total number of Kidney patients in the world be .
The number of Kidney patients in South America is:
If we look at the relationship between the decrease in South America's kidney patients and the overall world decrease:
A decrease of 20% in the South American kidney patients corresponds to:
This results in an 8% decrease in the total number of Kidney patients in the world.
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