Table I shows the disease-wise percentage distribution of patients in the world. Table II shows the continent-wise percentage distribution of all patients and of kidney patients. The total world population in 2023 is 800 crore and 10 percent of them are patients.
| Disease | Percentage |
|---|---|
| Heart Disease | 22 |
| AIDS | 10 |
| TB | 8 |
| Hepatitis | 6 |
| Kidney Disease | 30 |
| Others | 24 |
| Continent | 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?
The decrease is 10 percent, so that is the answer.
There are 80 crore patients, of whom 30 percent, that is 24 crore, have kidney disease.
South America holds 40 percent of the kidney patients, which is 9.6 crore.
A 25 percent decrease there removes 2.4 crore kidney patients.
This 2.4 crore is measured against the world total of 24 crore kidney patients.
2.4 crore out of 24 crore is a 10 percent decrease.
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