Insecticide-treated mosquito nets were given to four villages. The table shows the number of cases of malaria before and after the nets were given out. In which village did the number of cases fall by the greatest percentage?
Table: The number of cases of malaria per 1000 people in four villages before and after insecticide-treated mosquito nets were given out
| Village | Cases per 1000 people before | Cases per 1000 people after |
|---|---|---|
| W | 200 | 150 |
| X | 120 | 84 |
| Y | 80 | 52 |
| Z | 50 | 40 |
Village W
Village X
Village Y
Village Z
176 exam-style questions on AQA GCSE Biology 3.1 Communicable diseases, covering 3.1.1 Communicable (infectious) diseases, 3.1.2 Viral diseases, 3.1.3 Bacterial diseases, 3.1.4 Fungal diseases, 3.1.5 Protist diseases, 3.1.6 Human defence systems, 3.1.7 Vaccination, 3.1.8 Antibiotics and painkillers, and 3.1.9 Discovery and development of drugs. Each one has a worked solution and a mark scheme showing where the marks go.