PSLE Barbara has a number of notebooks in three colours: red, purple and yellow.
29 of the notebooks are red. The number of red notebooks is four times the number of purple notebooks. What fraction of the notebooks is yellow?
Red |
Purple |
Yellow |
Total |
2x2 |
7x2 |
9x2 |
4x1 |
1x1 |
|
|
4 u |
1 u |
13 u |
18 u |
Number of red notebooks is the repeated identity.
Make the number of red notebooks the same.
LCM of 2 and 4 = 4
Number of yellow notebooks
= 18 u - 4 u - 1 u
= 13 u
Fraction of the notebooks that is yellow
=
1318 Answer(s):
1318