The average number of girls in 4A, 4B and 4C is 19. This is 5 more than the average number of boys in the 3 rooms.
17 of the total number of boys are in 4C.
32 of the number of boys in 4B is the same as
37 of the total number of boys in the 3 rooms. What fraction of the total number of girls in the 3 rooms is in 4A if there are 40 children in 4A?
Boys in 4A |
Boys in 4B |
Boys in 4C |
Total boys |
6 |
1 |
7 |
|
2 |
|
7 |
4 u |
2 u |
1 u |
7 u |
32 of boys in 4B =
37 of all boys
Boys in 4B : All boys = 2 : 7
Average number of boys
= 19 - 5
= 14
Total number of boys
= 3 x 14
= 42
7 u = 42
1 u = 42 ÷ 7 = 6
Number of boys in Room 4A
= 4 u
= 4 x 6
= 24
Number of girls in Room 4A
= 40 - 24
= 16
Total number of girls
= 3 x 19
= 57
Girls in 4ATotal girls =
1657 Answer(s):
1657