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