Number of employees in six offices A–F of an IT company, 2018–2023.
| Year | A | B | C | D | E | F |
|---|---|---|---|---|---|---|
| 2018 | 290 | 176 | 222 | 240 | 280 | 272 |
| 2019 | 256 | 152 | 240 | 224 | 304 | 264 |
| 2020 | 272 | 192 | 264 | 248 | 316 | 280 |
| 2021 | 366 | 184 | 250 | 270 | 332 | 252 |
| 2022 | 320 | 214 | 280 | 236 | 340 | 292 |
| 2023 | 300 | 226 | 296 | 258 | 348 | 300 |
What is the difference between the average number of employees working in office D and office E over all six years?
A74 ✓ Correct
B66
C72
D70
Correct answer: (A) 74
Explanation
The difference is 74, so that is the answer.
Office D totals 1476 over six years, averaging 246.
Office E totals 1920 over six years, averaging 320.
The difference of the averages is 320 minus 246.
That equals 74.
Hence 74 is correct.
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