PSLE A bag contains cards of three different colours.
15 of the cards are red. The ratio of the number of purple cards to that of blue cards is 3 : 4. What is the ratio of the number of red cards to that of blue cards?
Red |
Purple |
Blue |
Total |
1x7 |
4x7 |
5x7 |
|
3x4 |
4x4 |
|
7 u |
12 u |
16 u |
35 u |
The total number of blue and purple cards is the combined repeated identity.
Make the total number blue and purple cards the same.
LCM of 4 and 7 = 28
Red : Blue
7 : 16
Answer(s): 7 : 16