PSLE Diana has a number of files in three colours: brown, green and red.
310 of the files are brown. The number of brown files is twice the number of green files. What fraction of the files is red?
Brown |
Green |
Red |
Total |
3x2 |
7x2 |
10x2 |
2x3 |
1x3 |
|
|
6 u |
3 u |
11 u |
20 u |
Number of brown files is the repeated identity.
Make the number of brown files the same.
LCM of 3 and 2 = 6
Number of red files
= 20 u - 6 u - 3 u
= 11 u
Fraction of the files that is red
=
1120 Answer(s):
1120