PSLE A bag contains coins of three different colours.
15 of the coins are red. The ratio of the number of purple coins to that of green coins is 2 : 3. What is the ratio of the number of red coins to that of green coins?
Red |
Purple |
Green |
Total |
1x5 |
4x5 |
5x5 |
|
2x4 |
3x4 |
|
5 u |
8 u |
12 u |
25 u |
The total number of green and purple coins is the combined repeated identity.
Make the total number green and purple coins the same.
LCM of 4 and 5 = 20
Red : Green
5 : 12
Answer(s): 5 : 12