PSLE A bag contains marbles of three different colours.
18 of the marbles are blue. The ratio of the number of purple marbles to that of yellow marbles is 1 : 4. What is the ratio of the number of purple marbles to that of blue marbles?
Blue |
Purple |
Yellow |
Total |
1x5 |
7x5 |
8x5 |
|
1x7 |
4x7 |
|
5 u |
7 u |
28 u |
40 u |
The total number of yellow and purple marbles is the combined repeated identity.
Make the total number yellow and purple marbles the same.
LCM of 7 and 5 = 35
Purple : Blue
7 : 5
Answer(s): 7 : 5