PSLE A bag contains marbles of three different colours.
17 of the marbles are red. The ratio of the number of green marbles to that of brown marbles is 7 : 3. What is the ratio of the number of red marbles to that of brown marbles?
Red |
Green |
Brown |
Total |
1x5 |
6x5 |
7x5 |
|
7x3 |
3x3 |
|
5 u |
21 u |
9 u |
35 u |
The total number of brown and green marbles is the combined repeated identity.
Make the total number brown and green marbles the same.
LCM of 6 and 10 = 30
Red : Brown
5 : 9
Answer(s): 5 : 9