PSLE A bag contains erasers of three different colours.
17 of the erasers are orange. The ratio of the number of blue erasers to that of green erasers is 5 : 2. What is the ratio of the number of orange erasers to that of green erasers?
Orange |
Blue |
Green |
Total |
1x7 |
6x7 |
7x7 |
|
5x6 |
2x6 |
|
7 u |
30 u |
12 u |
49 u |
The total number of green and blue erasers is the combined repeated identity.
Make the total number green and blue erasers the same.
LCM of 6 and 7 = 42
Orange : Green
7 : 12
Answer(s): 7 : 12