PSLE A bag contains cards of three different colours.
18 of the cards are red. The ratio of the number of blue cards to that of purple cards is 1 : 1. What is the ratio of the number of red cards to that of purple cards?
Red |
Blue |
Purple |
Total |
1x2 |
7x2 |
8x2 |
|
1x7 |
1x7 |
|
2 u |
7 u |
7 u |
16 u |
The total number of purple and blue cards is the combined repeated identity.
Make the total number purple and blue cards the same.
LCM of 7 and 2 = 14
Red : Purple
2 : 7
Answer(s): 2 : 7