The ratio of the number of girls to the number of boys in a class is 3 : 4. The ratio of the pupils in the class who scored merit to those who did not score merit is 5 : 1. The ratio of the girls who scored merit to those who did not score merit is 17 : 1. What is the ratio of boys who scored merit to the boys who did not score merit?
Girls |
Boys |
Total |
3x6 = 18 u |
4x6 = 24 u |
7x6 = 42 u |
Merit |
No merit |
Total |
5x7 = 35 u |
1x7 = 7 u |
6x7 = 42 u |
Girls |
Boys |
Total |
18 u |
24 u |
42 u |
Merit |
No Merit |
Merit |
No merit |
|
17 u |
1 u |
18 u |
6 u |
42 u |
The total number of pupils remains unchanged. Make the total number of pupils the same. LCM of 7 and 6 is 42.
Boys who scored merit : Boys who did not score merit
18 : 6
3 : 1
Answer(s): 3 : 1