PSLE A bag contains erasers of three different colours.
110 of the erasers are orange. The ratio of the number of blue erasers to that of red erasers is 1 : 1. What is the ratio of the number of blue erasers to that of orange erasers?
Orange |
Blue |
Red |
Total |
1x2 |
9x2 |
10x2 |
|
1x9 |
1x9 |
|
2 u |
9 u |
9 u |
20 u |
The total number of red and blue erasers is the combined repeated identity.
Make the total number red and blue erasers the same.
LCM of 9 and 2 = 18
Blue : Orange
9 : 2
Answer(s): 9 : 2