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