Study the following table and answer the question below.
| School name | Total number of students enrolled | Percentage of enrolled students who opted for Biology | Ratio of male to female students who opted for Biology |
| A | 900 | 30% | 7 : 8 |
| B | 400 | 38% | 9 : 10 |
| C | 1000 | 24% | 5 : 19 |
| D | 800 | 18% | 5 : 7 |
What is the ratio of the total number of male students to that of female students who opted for Biology in schools A and D together?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 31 : 38.
In school A,
Total number of students = 900
Number of students opted biology = 30% of 900 = 270
Number of males = 7/15 × 270 = 126
Number of females = 270 - 126 = 144
In school D,
Total number of students = 800
Number of students opted biology = 18% of 800 = 144
Number of males = 5/12 × 144 = 60
Number of females = 144 - 60 = 84
Tota males = 126 + 60 = 186
Total females = 144 + 84 = 228
Required ratio = 186 : 228 = 31 : 38