PSLE Jaslyn has a number of files in three colours: brown, blue and green.
57 of the files are brown. The number of brown files is thrice the number of blue files. What fraction of the files is green?
Brown |
Blue |
Green |
Total |
5x3 |
2x3 |
7x3 |
3x5 |
1x5 |
|
|
15 u |
5 u |
1 u |
21 u |
Number of brown files is the repeated identity.
Make the number of brown files the same.
LCM of 5 and 3 = 15
Number of green files
= 21 u - 15 u - 5 u
= 1 u
Fraction of the files that is green
=
121 Answer(s):
121