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