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In a certain school, 10% of the students have less than 75% attendance and are not allowed to sit in the exam, but 20% of the students who have less than 75% attendance are allowed to sit in the exam. What percent of the students in the school have less than 75% attendance ?
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- 30%
- 12.5%
- 15%
- 10.5%
Correct Option: B
Let the number of students with less than 75% attendance = y
Total students in school = x
According to the question,
| + | = y | 10 | 5 |
| ⇒ | = y - | = | 10 | 5 | 5 |
| ⇒ | = 4y ⇒ | = | 2 | x | 8 |
| ⇒ | × 100 = | = 12.5% | x | 8 |
