Percentage distribution of students qualifying an entrance exam from seven schools A–G, 2020 and 2021. School G: 90 (2020), 135 (2021).
| School | 2020 (%) | 2021 (%) |
|---|---|---|
| A | 21 | 23 |
| B | 14 | 8 |
| C | 16 | 11 |
| D | 10 | 14 |
| E | 18 | 16 |
| F | 9 | 13 |
| G | 12 | 15 |
The ratio of the number of students qualifying from Schools B, C and D in 2020 to that from Schools E, F and G in 2021 is
A2:3
B51:75
C3:2
D25:33 ✓ Correct
Correct answer: (D) 25:33
Explanation
The answer is 25 to 33.
Schools B, C and D in 2020 are 40 percent of 750, which is 300.
Schools E, F and G in 2021 are 44 percent of 900, which is 396.
So the ratio is 300 to 396.
Dividing both by 12 gives 25 to 33.
So the ratio simplifies to 25 to 33.
So the answer is 25 to 33.
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