PSLE A bag contains erasers of three different colours.
15 of the erasers are orange. The ratio of the number of brown erasers to that of red erasers is 7 : 3. What is the ratio of the number of orange erasers to that of red erasers?
Orange |
Brown |
Red |
Total |
1x5 |
4x5 |
5x5 |
|
7x2 |
3x2 |
|
5 u |
14 u |
6 u |
25 u |
The total number of red and brown erasers is the combined repeated identity.
Make the total number red and brown erasers the same.
LCM of 4 and 10 = 20
Orange : Red
5 : 6
Answer(s): 5 : 6