The average number of boys in 6A, 6B and 6C is 16. This is 2 more than the average number of girls in the 3 rooms.
17 of the total number of girls are in 6C.
52 of the number of girls in 6B is the same as
57 of the total number of girls in the 3 rooms. What fraction of the total number of boys in the 3 rooms is in 6A if there are 34 children in 6A?
| Girls in 6A |
Girls in 6B |
Girls in 6C |
Total girls |
| 6 |
1 |
7 |
| |
2 |
|
7 |
| 4 u |
2 u |
1 u |
7 u |
52 of girls in 6B =
57 of all girls
Girls in 6B : All girls = 2 : 7
Average number of girls
= 16 - 2
= 14
Total number of girls
= 3 x 14
= 42
7 u = 42
1 u = 42 ÷ 7 = 6
Number of girls in Room 6A
= 4 u
= 4 x 6
= 24
Number of boys in Room 6A
= 34 - 24
= 10
Total number of boys
= 3 x 16
= 48
Boys in 6ATotal boys =
1048 =
524 Answer(s):
524 
