Table shows the number of girls enrolled in three schools A, B and C from 2017 to 2021.
| Year | A | B | C |
|---|---|---|---|
| 2017 | 200 | 150 | 100 |
| 2018 | 150 | 225 | 250 |
| 2019 | 275 | 150 | 199 |
| 2020 | 250 | 300 | 200 |
| 2021 | 300 | 250 | 275 |
The difference between the number of girls enrolled in the year 2021 and 2017 is minimum in
AOnly School A
BOnly School B
COnly School C
DBoth School A and School B ✓ Correct
Correct answer: (D) Both School A and School B
Explanation
The difference is minimum in both School A and School B, so that is the answer.
In School A the difference is 300 minus 200, which is 100.
In School B the difference is 250 minus 150, which is 100.
In School C the difference is 275 minus 100, which is 175.
So Schools A and B both have a difference of 100, the smallest value.
School C has the larger difference of 175.
So the difference is minimum in both School A and School B.
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