PSLE Fanny has a number of notebooks in three colours: purple, orange and brown.
59 of the notebooks are purple. The number of purple notebooks is thrice the number of orange notebooks. What fraction of the notebooks is brown?
Purple |
Orange |
Brown |
Total |
5x3 |
4x3 |
9x3 |
3x5 |
1x5 |
|
|
15 u |
5 u |
7 u |
27 u |
Number of purple notebooks is the repeated identity.
Make the number of purple notebooks the same.
LCM of 5 and 3 = 15
Number of brown notebooks
= 27 u - 15 u - 5 u
= 7 u
Fraction of the notebooks that is brown
=
727 Answer(s):
727