PSLE Cathy has a number of markers in three colours: purple, brown and green.
47 of the markers are purple. The number of purple markers is thrice the number of brown markers. What fraction of the markers is green?
Purple |
Brown |
Green |
Total |
4x3 |
3x3 |
7x3 |
3x4 |
1x4 |
|
|
12 u |
4 u |
5 u |
21 u |
Number of purple markers is the repeated identity.
Make the number of purple markers the same.
LCM of 4 and 3 = 12
Number of green markers
= 21 u - 12 u - 4 u
= 5 u
Fraction of the markers that is green
=
521 Answer(s):
521