PSLE Fiona has a number of notebooks in three colours: orange, red and brown.
13 of the notebooks are orange. The number of orange notebooks is four times the number of red notebooks. What fraction of the notebooks is brown?
Orange |
Red |
Brown |
Total |
1x4 |
2x4 |
3x4 |
4x1 |
1x1 |
|
|
4 u |
1 u |
7 u |
12 u |
Number of orange notebooks is the repeated identity.
Make the number of orange notebooks the same.
LCM of 1 and 4 = 4
Number of brown notebooks
= 12 u - 4 u - 1 u
= 7 u
Fraction of the notebooks that is brown
=
712 Answer(s):
712