PSLE A bag contains marbles of three different colours.
18 of the marbles are orange. The ratio of the number of red marbles to that of brown marbles is 1 : 3. What is the ratio of the number of red marbles to that of orange marbles?
Orange |
Red |
Brown |
Total |
1x4 |
7x4 |
8x4 |
|
1x7 |
3x7 |
|
4 u |
7 u |
21 u |
32 u |
The total number of brown and red marbles is the combined repeated identity.
Make the total number brown and red marbles the same.
LCM of 7 and 4 = 28
Red : Orange
7 : 4
Answer(s): 7 : 4