Study the following table and answer the question below.
| School Name | Total number of students enrolled |
Percentage age of enrolled student of the biology student in the |
The ratio of male to female students who opted for Biology |
| A | 900 | 30 | 7 : 8 |
| B | 400 | 36 | 5 : 7 |
| C | 1000 | 24 | 5 : 19 |
| D | 800 | 18 | 3 : 9 |
Find the ratio of the number of female students who opted biology in school B and school D.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 7 : 9
Calculation:
Number of female students who opted biology in school B = 400 × 36% × 7 / (7 + 5) = 84
Number of female students who opted biology in school D = 800 × 18% × 9 / (3 + 9) = 108
Now, the ratio = 84/108 = 7/9
So ,The ratio of the number of female students who opted for biology in school B and school D is 7 : 9.