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