PSLE A bag contains erasers of three different colours.
13 of the erasers are yellow. The ratio of the number of purple erasers to that of blue erasers is 3 : 5. What is the ratio of the number of yellow erasers to that of blue erasers?
Yellow |
Purple |
Blue |
Total |
1x4 |
2x4 |
3x4 |
|
3x1 |
5x1 |
|
4 u |
3 u |
5 u |
12 u |
The total number of blue and purple erasers is the combined repeated identity.
Make the total number blue and purple erasers the same.
LCM of 2 and 8 = 8
Yellow : Blue
4 : 5
Answer(s): 4 : 5