Question : Study the following table and answer the question below.
| School name | Total number of students enrolled | Percentage of enrolled students, who opted for Biology | The ratio of male to female students who opted for Biology |
| A | 900 | 30 | 7 : 8 |
| B | 400 | 36 | 9 : 10 |
| C | 1000 | 24 | 5 : 19 |
| D | 800 | 18 | 5 : 7 |
Find the ratio of the number of students who opted for biology in school B and school D.
Option 1: 1 : 4
Option 2: 1 : 2
Option 3: 1 : 1
Option 4: 2 : 1
Correct Answer: 1 : 1
Solution :
Total students in school B = 400
Students opted for biology in school B = 36% = $\frac{36}{100}\times400=144$
Total students in school D = 800
Students opted for biology in school D = 18% = $\frac{18}{100}\times800=144$
The ratio of students of B to D = 144 : 144 = 1 : 1
Hence, the correct answer is 1 : 1.
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