The average number of girls in 3A, 3B and 3C is 12. This is 3 more than the average number of boys in the 3 rooms.
19 of the total number of boys are in 3C.
52 of the number of boys in 3B is the same as
59 of the total number of boys in the 3 rooms. What fraction of the total number of girls in the 3 rooms is in 3A if there are 37 children in 3A?
| Boys in 3A |
Boys in 3B |
Boys in 3C |
Total boys |
| 8 |
1 |
9 |
| |
2 |
|
9 |
| 6 u |
2 u |
1 u |
9 u |
52 of boys in 3B =
59 of all boys
Boys in 3B : All boys = 2 : 9
Average number of boys
= 12 - 3
= 9
Total number of boys
= 3 x 9
= 27
9 u = 27
1 u = 27 ÷ 9 = 3
Number of boys in Room 3A
= 6 u
= 6 x 3
= 18
Number of girls in Room 3A
= 37 - 18
= 19
Total number of girls
= 3 x 12
= 36
Girls in 3ATotal girls =
1936 Answer(s):
1936 
