PSLE A bag contains marbles of three different colours.
12 of the marbles are purple. The ratio of the number of orange marbles to that of brown marbles is 4 : 5. What is the ratio of the number of purple marbles to that of brown marbles?
Purple |
Orange |
Brown |
Total |
1x9 |
1x9 |
2x9 |
|
4x1 |
5x1 |
|
9 u |
4 u |
5 u |
18 u |
The total number of brown and orange marbles is the combined repeated identity.
Make the total number brown and orange marbles the same.
LCM of 1 and 9 = 9
Purple : Brown
9 : 5
Answer(s): 9 : 5