PSLE A bag contains cards of three different colours.
18 of the cards are yellow. The ratio of the number of orange cards to that of brown cards is 2 : 3. What is the ratio of the number of yellow cards to that of brown cards?
Yellow |
Orange |
Brown |
Total |
1x5 |
7x5 |
8x5 |
|
2x7 |
3x7 |
|
5 u |
14 u |
21 u |
40 u |
The total number of brown and orange cards is the combined repeated identity.
Make the total number brown and orange cards the same.
LCM of 7 and 5 = 35
Yellow : Brown
5 : 21
Answer(s): 5 : 21