The average number of girls in 3A, 3B and 3C is 16. This is 2 more than the average number of boys in the 3 rooms.
114 of the total number of boys are in 3C.
32 of the number of boys in 3B is the same as
314 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 45 children in 3A?
| Boys in 3A |
Boys in 3B |
Boys in 3C |
Total boys |
| 13 |
1 |
14 |
| |
2 |
|
14 |
| 11 u |
2 u |
1 u |
14 u |
32 of boys in 3B =
314 of all boys
Boys in 3B : All boys = 2 : 14
Average number of boys
= 16 - 2
= 14
Total number of boys
= 3 x 14
= 42
14 u = 42
1 u = 42 ÷ 14 = 3
Number of boys in Room 3A
= 11 u
= 11 x 3
= 33
Number of girls in Room 3A
= 45 - 33
= 12
Total number of girls
= 3 x 16
= 48
Girls in 3ATotal girls =
1248 =
14 Answer(s):
14 
