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:

What is the difference in the number of female lecturers in chemistry and Mathematics?

25

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