PSLE A bag contains marbles of three different colours.
18 of the marbles are purple. The ratio of the number of blue marbles to that of green marbles is 1 : 2. What is the ratio of the number of purple marbles to that of green marbles?
Purple |
Blue |
Green |
Total |
1x3 |
7x3 |
8x3 |
|
1x7 |
2x7 |
|
3 u |
7 u |
14 u |
24 u |
The total number of green and blue marbles is the combined repeated identity.
Make the total number green and blue marbles the same.
LCM of 7 and 3 = 21
Purple : Green
3 : 14
Answer(s): 3 : 14