PSLE Penelope has a number of notebooks in three colours: red, green and brown.
15 of the notebooks are red. The number of red notebooks is thrice the number of green notebooks. What fraction of the notebooks is brown?
Red |
Green |
Brown |
Total |
1x3 |
4x3 |
5x3 |
3x1 |
1x1 |
|
|
3 u |
1 u |
11 u |
15 u |
Number of red notebooks is the repeated identity.
Make the number of red notebooks the same.
LCM of 1 and 3 = 3
Number of brown notebooks
= 15 u - 3 u - 1 u
= 11 u
Fraction of the notebooks that is brown
=
1115 Answer(s):
1115