PSLE A bag contains erasers of three different colours.
13 of the erasers are green. The ratio of the number of brown erasers to that of purple erasers is 7 : 3. What is the ratio of the number of brown erasers to that of green erasers?
Green |
Brown |
Purple |
Total |
1x5 |
2x5 |
3x5 |
|
7x1 |
3x1 |
|
5 u |
7 u |
3 u |
15 u |
The total number of purple and brown erasers is the combined repeated identity.
Make the total number purple and brown erasers the same.
LCM of 2 and 10 = 10
Brown : Green
7 : 5
Answer(s): 7 : 5