The ratio of the number of girls to the number of boys in a class is 3 : 5. The ratio of the pupils in the class who scored gold to those who did not score gold is 4 : 1. The ratio of the girls who scored gold to those who did not score gold is 11 : 4. What is the ratio of boys who scored gold to the boys who did not score gold?
Girls |
Boys |
Total |
3x5 = 15 u |
5x5 = 25 u |
8x5 = 40 u |
Gold |
No gold |
Total |
4x8 = 32 u |
1x8 = 8 u |
5x8 = 40 u |
Girls |
Boys |
Total |
15 u |
25 u |
40 u |
Gold |
No Gold |
Gold |
No gold |
|
11 u |
4 u |
21 u |
4 u |
40 u |
The total number of pupils remains unchanged. Make the total number of pupils the same. LCM of 8 and 5 is 40.
Boys who scored gold : Boys who did not score gold
21 : 4
Answer(s): 21 : 4