PSLE A bag contains coins of three different colours.
15 of the coins are brown. The ratio of the number of orange coins to that of red coins is 7 : 2. What is the ratio of the number of orange coins to that of brown coins?
Brown |
Orange |
Red |
Total |
1x9 |
4x9 |
5x9 |
|
7x4 |
2x4 |
|
9 u |
28 u |
8 u |
45 u |
The total number of red and orange coins is the combined repeated identity.
Make the total number red and orange coins the same.
LCM of 4 and 9 = 36
Orange : Brown
28 : 9
Answer(s): 28 : 9