The ratio of the total number of students scoring marks less than 50% to that of scoring marks exactly 50% is:
| School | Number of students scoring marks less than 50% | Percentage of students scoring marks more than 50% | Number of students appeared |
| A | 270 | 55 | 600 |
| B | 120 | 40 | 400 |
| C | 300 | 20 | 375 |
| D | 220 | 10 | 350 |
| E | 200 | 25 | 300 |
Study the above table and answer the question.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 111: 24
The total number of students scoring marks less than 50% = 270 +120 + 300 + 220 + 200 = 1110
The total number of students scoring marks more than 50% = 55% *600 + 40% * 400 + 20% * 375 + 10% * 350 + 25% * 300
= 330 + 160 + 75 + 35 + 75 = 675
Total students = 600 + 400 + 375 + 350 + 300 = 2025
The total number of students scoring marks exactly 50% = 2025 - 1110 - 675 = 240
Hence, the required ratio = 1110 / 240 = 111/24 = 111: 24