PSLE A bag contains marbles of three different colours.
13 of the marbles are brown. The ratio of the number of blue marbles to that of purple marbles is 1 : 7. What is the ratio of the number of brown marbles to that of purple marbles?
Brown |
Blue |
Purple |
Total |
1x4 |
2x4 |
3x4 |
|
1x1 |
7x1 |
|
4 u |
1 u |
7 u |
12 u |
The total number of purple and blue marbles is the combined repeated identity.
Make the total number purple and blue marbles the same.
LCM of 2 and 8 = 8
Brown : Purple
4 : 7
Answer(s): 4 : 7