Study the given pie-chart and table carefully and answer the question that follows. The percentage-wise distribution of lectures in five different subjects in a university is shown in the pie-chart. The total number of lecturers is 500.
Ratio of male to female lecturers:
| Lecturers | Males : Females |
| Mathematics | 7 : 3 |
| Physics | 2 : 3 |
| Chemistry | 4 : 1 |
| Botany | 3 : 5 |
| Zoology | 2 : 5 |
What is the difference in the number of female lecturers in chemistry and Mathematics?
Answer & explanation
Correct answer: option 4
Total number of lecturers = 500
Number of lecturer in chemistry = \(\frac{20 }{100 }\) × 500 = 100
Ratio of male to female lecturer in chemistry = 4 : 1
Female lecturer in chemistry = \(\frac{1 }{5 }\) × 100 = 20
Number of lecturer in Mathematics = \(\frac{30 }{100 }\) × 500 = 150
Ratio of male to female lecturer in mathematics = 7 : 3
Female lecturer in chemistry = \(\frac{3 }{10 }\) × 100 = 45
Difference in number of females in chemistry and mathematics = 45 - 20 = 25