The ratio of the number of girls to the number of boys in a class is 2 : 5. The ratio of the pupils in the class who scored gold to those who did not score gold is 3 : 1. The ratio of the girls who scored gold to those who did not score gold is 5 : 3. What is the ratio of boys who scored gold to the boys who did not score gold?
Girls |
Boys |
Total |
2x4 = 8 u |
5x4 = 20 u |
7x4 = 28 u |
Gold |
No gold |
Total |
3x7 = 21 u |
1x7 = 7 u |
4x7 = 28 u |
Girls |
Boys |
Total |
8 u |
20 u |
28 u |
Gold |
No Gold |
Gold |
No gold |
|
5 u |
3 u |
16 u |
4 u |
28 u |
The total number of pupils remains unchanged. Make the total number of pupils the same. LCM of 7 and 4 is 28.
Boys who scored gold : Boys who did not score gold
16 : 4
4 : 1
Answer(s): 4 : 1