PSLE A bag contains erasers of three different colours.
18 of the erasers are orange. The ratio of the number of brown erasers to that of red erasers is 1 : 2. What is the ratio of the number of orange erasers to that of red erasers?
Orange |
Brown |
Red |
Total |
1x3 |
7x3 |
8x3 |
|
1x7 |
2x7 |
|
3 u |
7 u |
14 u |
24 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 7 and 3 = 21
Orange : Red
3 : 14
Answer(s): 3 : 14