PSLE Jean has a number of files in three colours: red, yellow and blue.
17 of the files are red. The number of red files is thrice the number of yellow files. What fraction of the files is blue?
Red |
Yellow |
Blue |
Total |
1x3 |
6x3 |
7x3 |
3x1 |
1x1 |
|
|
3 u |
1 u |
17 u |
21 u |
Number of red files is the repeated identity.
Make the number of red files the same.
LCM of 1 and 3 = 3
Number of blue files
= 21 u - 3 u - 1 u
= 17 u
Fraction of the files that is blue
=
1721 Answer(s):
1721