PSLE A bag contains erasers of three different colours.
17 of the erasers are purple. The ratio of the number of green erasers to that of red erasers is 3 : 7. What is the ratio of the number of green erasers to that of purple erasers?
Purple |
Green |
Red |
Total |
1x5 |
6x5 |
7x5 |
|
3x3 |
7x3 |
|
5 u |
9 u |
21 u |
35 u |
The total number of red and green erasers is the combined repeated identity.
Make the total number red and green erasers the same.
LCM of 6 and 10 = 30
Green : Purple
9 : 5
Answer(s): 9 : 5