PSLE A bag contains coins of three different colours.
15 of the coins are green. The ratio of the number of red coins to that of orange coins is 1 : 9. What is the ratio of the number of green coins to that of orange coins?
Green |
Red |
Orange |
Total |
1x5 |
4x5 |
5x5 |
|
1x2 |
9x2 |
|
5 u |
2 u |
18 u |
25 u |
The total number of orange and red coins is the combined repeated identity.
Make the total number orange and red coins the same.
LCM of 4 and 10 = 20
Green : Orange
5 : 18
Answer(s): 5 : 18