Science as a share of the school — Aptitude Question
Science as a share of the school: | Stream | Boys | Girls | Total | |------------|------|-------|-------| | Science… Answer and worked solution on CodeKairo.
- Topic: Tables & Charts
- Section: Data Interpretation
- Difficulty: Easy
- Time target: 45 seconds
Question
| Stream | Boys | Girls | Total |
|---|---|---|---|
| Science | 240 | 160 | 400 |
| Commerce | 180 | 120 | 300 |
| Arts | 80 | 220 | 300 |
| Total | 500 | 500 | 1000 |
What percentage of all students study Science?
Options
- 30%
- 35%
- 40%
- 45%
Show the answer and the worked solution
Correct answer: C. 40%
Worked solution
- 400 out of 1,000 = 40%.
Answer: 40%.
The idea
The totals row is given, so use it rather than re-adding the columns. That is what a totals row is for.
Shortcut. With a total of exactly 1,000, a share in percent is the count ÷ 10: 400 → 40%.
Common trap. 30% — the share of Commerce or Arts (300 students each), picked up by reading the wrong row's total.