Study the following table and answer questions:
Number of students studying in five schools of a city
| Schools | No of Students | Ratio of boys and girls Boys : Girls |
| A | 680 | 9:08 |
| B | 720 | 4:05 |
| C | 540 | 5:13 |
| D | 660 | 2:01 |
| E | 900 | 13:12 |
In how many schools, the number of girls is more than the average number of boys per school?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 3.
Number of boys in school A = 680(9/17) = 360
Number of girls in school A = 680 - 360 = 320
Number of boys in school B = 720(4/9) = 320
Number of girls in school B = 720 - 320 = 400
Number of boys in school C = 540(5/18) = 150
Number of girls in school C = 540 - 150 = 390
Number of boys in school D = 660(2/3) = 440
Number of girls in school D = 660 - 440 = 220
Number of boys in school E = 900(13/25) = 468
Number of girls in school E = 900 - 468 = 432
Average = Sum of all observations/Total observations
Average of number of boys per school = (360 + 320 + 150 + 440 + 468)/5 = 1838/5 = 367.6
Therefore three schools have the girls more than average boys per school.