Percentage of girls in a stream — Aptitude Question
Percentage of girls in a stream: Students by stream and sex: | Stream | Boys | Girls | Total |… Answer and worked solution on CodeKairo.
- Topic: Tables & Charts
- Section: Data Interpretation
- Difficulty: Medium
- Time target: 75 seconds
Question
Students by stream and sex:
| Stream | Boys | Girls | Total |
|---|---|---|---|
| Science | 240 | 160 | 400 |
| Commerce | 180 | 120 | 300 |
| Arts | 80 | 220 | 300 |
| Total | 500 | 500 | 1000 |
What percentage of Arts students are girls?
Options
- 66⅔%
- 70%
- 73⅓%
- 75%
Show the answer and the worked solution
Correct answer: C. 73⅓%
Worked solution
- Arts: 220 girls out of 300 students.
- 220/300 = 11/15 = 73⅓%.
Answer: 73⅓%.
The idea
The base is the stream total, not the total number of girls in the school. Choosing the wrong base is what the distractors test.
Shortcut. 220/300 = 11/15; 1/15 is 6⅔%, so 11/15 is 73⅓%. Or: 225 girls would be 75%, and 220 is a little under.
Common trap. 75% — reading 220 out of 300 as roughly three-quarters; exactly three-quarters would need 225 girls.