PSLE Opal has a number of files in three colours: brown, orange and red.
27 of the files are brown. The number of brown files is thrice the number of orange files. What fraction of the files is red?
Brown |
Orange |
Red |
Total |
2x3 |
5x3 |
7x3 |
3x2 |
1x2 |
|
|
6 u |
2 u |
13 u |
21 u |
Number of brown files is the repeated identity.
Make the number of brown files the same.
LCM of 2 and 3 = 6
Number of red files
= 21 u - 6 u - 2 u
= 13 u
Fraction of the files that is red
=
1321 Answer(s):
1321