PSLE A bag contains marbles of three different colours.
15 of the marbles are blue. The ratio of the number of purple marbles to that of green marbles is 7 : 1. What is the ratio of the number of purple marbles to that of blue marbles?
Blue |
Purple |
Green |
Total |
1x2 |
4x2 |
5x2 |
|
7x1 |
1x1 |
|
2 u |
7 u |
1 u |
10 u |
The total number of green and purple marbles is the combined repeated identity.
Make the total number green and purple marbles the same.
LCM of 4 and 8 = 8
Purple : Blue
7 : 2
Answer(s): 7 : 2