PSLE A bag contains cards of three different colours.
13 of the cards are red. The ratio of the number of blue cards to that of green cards is 3 : 7. What is the ratio of the number of red cards to that of green cards?
Red |
Blue |
Green |
Total |
1x5 |
2x5 |
3x5 |
|
3x1 |
7x1 |
|
5 u |
3 u |
7 u |
15 u |
The total number of green and blue cards is the combined repeated identity.
Make the total number green and blue cards the same.
LCM of 2 and 10 = 10
Red : Green
5 : 7
Answer(s): 5 : 7