PSLE A bag contains erasers of three different colours.
18 of the erasers are yellow. The ratio of the number of orange erasers to that of purple erasers is 2 : 3. What is the ratio of the number of yellow erasers to that of purple erasers?
Yellow |
Orange |
Purple |
Total |
1x5 |
7x5 |
8x5 |
|
2x7 |
3x7 |
|
5 u |
14 u |
21 u |
40 u |
The total number of purple and orange erasers is the combined repeated identity.
Make the total number purple and orange erasers the same.
LCM of 7 and 5 = 35
Yellow : Purple
5 : 21
Answer(s): 5 : 21