The average number of boys in 6A, 6B and 6C is 19. This is 4 more than the average number of girls in the 3 rooms.
29 of the total number of girls are in 6C.
12 of the number of girls in 6B is the same as
19 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 35 students in 6A?
| Girls in 6A |
Girls in 6B |
Girls in 6C |
Total girls |
| 7 |
2 |
9 |
| |
2 |
|
9 |
| 5 u |
2 u |
2 u |
9 u |
12 of girls in 6B =
19 of all girls
Girls in 6B : All girls = 2 : 9
Average number of girls
= 19 - 4
= 15
Total number of girls
= 3 x 15
= 45
9 u = 45
1 u = 45 ÷ 9 = 5
Number of girls in Room 6A
= 5 u
= 5 x 5
= 25
Number of boys in Room 6A
= 35 - 25
= 10
Total number of boys
= 3 x 19
= 57
Boys in 6ATotal boys =
1057 Answer(s):
1057 
