PSLE A bag contains cards of three different colours.
15 of the cards are green. The ratio of the number of purple cards to that of blue cards is 1 : 9. What is the ratio of the number of green cards to that of blue cards?
Green |
Purple |
Blue |
Total |
1x5 |
4x5 |
5x5 |
|
1x2 |
9x2 |
|
5 u |
2 u |
18 u |
25 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 10 = 20
Green : Blue
5 : 18
Answer(s): 5 : 18