The average number of girls in 2A, 2B and 2C is 16. This is 3 more than the average number of boys in the 3 rooms.
113 of the total number of boys are in 2C.
52 of the number of boys in 2B is the same as
513 of the total number of boys in the 3 rooms. What fraction of the total number of girls in the 3 rooms is in 2A if there are 41 pupils in 2A?
Boys in 2A |
Boys in 2B |
Boys in 2C |
Total boys |
12 |
1 |
13 |
|
2 |
|
13 |
10 u |
2 u |
1 u |
13 u |
52 of boys in 2B =
513 of all boys
Boys in 2B : All boys = 2 : 13
Average number of boys
= 16 - 3
= 13
Total number of boys
= 3 x 13
= 39
13 u = 39
1 u = 39 ÷ 13 = 3
Number of boys in Room 2A
= 10 u
= 10 x 3
= 30
Number of girls in Room 2A
= 41 - 30
= 11
Total number of girls
= 3 x 16
= 48
Girls in 2ATotal girls =
1148 Answer(s):
1148