PSLE A bag contains coins of three different colours.
18 of the coins are green. The ratio of the number of red coins to that of blue coins is 2 : 3. What is the ratio of the number of green coins to that of blue coins?
Green |
Red |
Blue |
Total |
1x5 |
7x5 |
8x5 |
|
2x7 |
3x7 |
|
5 u |
14 u |
21 u |
40 u |
The total number of blue and red coins is the combined repeated identity.
Make the total number blue and red coins the same.
LCM of 7 and 5 = 35
Green : Blue
5 : 21
Answer(s): 5 : 21