PSLE A bag contains erasers of three different colours.
19 of the erasers are blue. The ratio of the number of orange erasers to that of brown erasers is 3 : 7. What is the ratio of the number of blue erasers to that of brown erasers?
Blue |
Orange |
Brown |
Total |
1x5 |
8x5 |
9x5 |
|
3x4 |
7x4 |
|
5 u |
12 u |
28 u |
45 u |
The total number of brown and orange erasers is the combined repeated identity.
Make the total number brown and orange erasers the same.
LCM of 8 and 10 = 40
Blue : Brown
5 : 28
Answer(s): 5 : 28