Example 2: Missing value from an average
Last Updated On: Fri Aug 28 2026| Subject | Marks |
|---|---|
| Mathematics | 78 |
| Science | 85 |
| English | ? |
| History | 70 |
| Geography | 82 |
A "?" marks a missing value.
Additional information
- The average marks over the five subjects are 80.
Question
How many marks did the student score in English?
Solution
- Total marks = 5 x 80 = 400.
- Known marks = 78 + 85 + 70 + 82 = 315.
- English = 400 - 315 = 85.