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In an examination average marks obtained by the girls of a class is 85 and the average marks obtained by the boys of the same class is 87. If the girls and boys are in the ratio 4 : 5, average marks of the whole class (approximately) is closest to
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- 85.9
- 86.1
- 86.4
- 86.5
- 85.9
Correct Option: B
Let Number of girls = 4y
Number of boys = 5y
| ∴ Required average marks = | 4y × 85 + 5y × 87 |
| 4y + 5y |
| Required average marks = | 340 + 435 |
| 9 |
| Required average marks = | 775 |
| 9 |
Required average marks = 86.1
