PSLE A bag contains erasers of three different colours.
12 of the erasers are blue. The ratio of the number of yellow erasers to that of red erasers is 1 : 2. What is the ratio of the number of blue erasers to that of red erasers?
Blue |
Yellow |
Red |
Total |
1x3 |
1x3 |
2x3 |
|
1x1 |
2x1 |
|
3 u |
1 u |
2 u |
6 u |
The total number of red and yellow erasers is the combined repeated identity.
Make the total number red and yellow erasers the same.
LCM of 1 and 3 = 3
Blue : Red
3 : 2
Answer(s): 3 : 2