PSLE A bag contains marbles of three different colours.
17 of the marbles are red. The ratio of the number of brown marbles to that of yellow marbles is 2 : 5. What is the ratio of the number of red marbles to that of yellow marbles?
Red |
Brown |
Yellow |
Total |
1x7 |
6x7 |
7x7 |
|
2x6 |
5x6 |
|
7 u |
12 u |
30 u |
49 u |
The total number of yellow and brown marbles is the combined repeated identity.
Make the total number yellow and brown marbles the same.
LCM of 6 and 7 = 42
Red : Yellow
7 : 30
Answer(s): 7 : 30