PSLE A bag contains erasers of three different colours.
16 of the erasers are brown. The ratio of the number of blue erasers to that of orange erasers is 5 : 2. What is the ratio of the number of blue erasers to that of brown erasers?
Brown |
Blue |
Orange |
Total |
1x7 |
5x7 |
6x7 |
|
5x5 |
2x5 |
|
7 u |
25 u |
10 u |
42 u |
The total number of orange and blue erasers is the combined repeated identity.
Make the total number orange and blue erasers the same.
LCM of 5 and 7 = 35
Blue : Brown
25 : 7
Answer(s): 25 : 7