PSLE Shiyun has a number of files in three colours: purple, blue and red.
411 of the files are purple. The number of purple files is thrice the number of blue files. What fraction of the files is red?
Purple |
Blue |
Red |
Total |
4x3 |
7x3 |
11x3 |
3x4 |
1x4 |
|
|
12 u |
4 u |
17 u |
33 u |
Number of purple files is the repeated identity.
Make the number of purple files the same.
LCM of 4 and 3 = 12
Number of red files
= 33 u - 12 u - 4 u
= 17 u
Fraction of the files that is red
=
1733 Answer(s):
1733