The table shows the percentage of boy students and the difference between the…
2023
The table shows the percentage of boy students and the difference between the number of boys and girls in six different schools (A-F) during four years (2019-2022).
School \ Year | 2019 Boys (%) | 2019 Diff (*) | 2020 Boys (%) | 2020 Diff (*) | 2021 Boys (%) | 2021 Diff (*) | 2022 Boys (%) | 2022 Diff (*) |
A | 70 | 136 | 60 | 70 | 75 | 184 | 60 | 86 |
B | 40 | 84 | 48 | 18 | 45 | 48 | 60 | 90 |
C | 44 | 60 | 55 | 24 | 60 | 52 | 56 | 24 |
D | 44 | 84 | 57 | 84 | 55 | 72 | 65 | 192 |
E | 75 | 280 | 60 | 136 | 70 | 264 | 66 | 224 |
F | 44 | 90 | 56 | 96 | 65 | 228 | 45 | 84 |
Note: Difference (*) means the difference between the number of boys and girls.
What is the difference between the total number of students who appeared for the exam from School B in the year 2020 and in the year 2022?
- A.
0
- B.
17
- C.
29
- D.
35
Show answer & explanation
Correct answer: A
First, calculate the total students for School B in 2020. Boys are 48%, so girls are 52%. The difference is 4% of the total, which equals 18. Total = 18 / 0.04 = 450.
Next, calculate the total students for School B in 2022. Boys are 60%, so girls are 40%. The difference is 20% of the total, which equals 90. Total = 90 / 0.20 = 450.
Finally, find the difference between the totals: 450 - 450 = 0.