PSLE Irene has a number of files in three colours: red, blue and purple.
13 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 |
1x3 |
2x3 |
3x3 |
3x1 |
1x1 |
|
|
3 u |
1 u |
5 u |
9 u |
Number of red files is the repeated identity.
Make the number of red files the same.
LCM of 1 and 3 = 3
Number of purple files
= 9 u - 3 u - 1 u
= 5 u
Fraction of the files that is purple
=
59 Answer(s):
59