PSLE A bag contains cards of three different colours.
15 of the cards are purple. The ratio of the number of blue cards to that of red cards is 1 : 7. What is the ratio of the number of blue cards to that of purple cards?
Purple |
Blue |
Red |
Total |
1x2 |
4x2 |
5x2 |
|
1x1 |
7x1 |
|
2 u |
1 u |
7 u |
10 u |
The total number of red and blue cards is the combined repeated identity.
Make the total number red and blue cards the same.
LCM of 4 and 8 = 8
Blue : Purple
1 : 2
Answer(s): 1 : 2