PSLE Xandra has a number of notebooks in three colours: purple, brown and blue.
310 of the notebooks are purple. The number of purple notebooks is twice the number of brown notebooks. What fraction of the notebooks is blue?
Purple |
Brown |
Blue |
Total |
3x2 |
7x2 |
10x2 |
2x3 |
1x3 |
|
|
6 u |
3 u |
11 u |
20 u |
Number of purple notebooks is the repeated identity.
Make the number of purple notebooks the same.
LCM of 3 and 2 = 6
Number of blue notebooks
= 20 u - 6 u - 3 u
= 11 u
Fraction of the notebooks that is blue
=
1120 Answer(s):
1120