PSLE Rachel has a number of files in three colours: yellow, red and brown.
15 of the files are yellow. The number of yellow files is twice the number of red files. What fraction of the files is brown?
Yellow |
Red |
Brown |
Total |
1x2 |
4x2 |
5x2 |
2x1 |
1x1 |
|
|
2 u |
1 u |
7 u |
10 u |
Number of yellow files is the repeated identity.
Make the number of yellow files the same.
LCM of 1 and 2 = 2
Number of brown files
= 10 u - 2 u - 1 u
= 7 u
Fraction of the files that is brown
=
710 Answer(s):
710