PSLE A bag contains erasers of three different colours.
12 of the erasers are orange. The ratio of the number of green erasers to that of red erasers is 9 : 1. What is the ratio of the number of green erasers to that of orange erasers?
Orange |
Green |
Red |
Total |
1x10 |
1x10 |
2x10 |
|
9x1 |
1x1 |
|
10 u |
9 u |
1 u |
20 u |
The total number of red and green erasers is the combined repeated identity.
Make the total number red and green erasers the same.
LCM of 1 and 10 = 10
Green : Orange
9 : 10
Answer(s): 9 : 10