PSLE A bag contains erasers of three different colours.
15 of the erasers are red. The ratio of the number of yellow erasers to that of purple erasers is 4 : 1. What is the ratio of the number of red erasers to that of purple erasers?
Red |
Yellow |
Purple |
Total |
1x5 |
4x5 |
5x5 |
|
4x4 |
1x4 |
|
5 u |
16 u |
4 u |
25 u |
The total number of purple and yellow erasers is the combined repeated identity.
Make the total number purple and yellow erasers the same.
LCM of 4 and 5 = 20
Red : Purple
5 : 4
Answer(s): 5 : 4