PSLE Usha has a number of notebooks in three colours: red, purple and blue.
25 of the notebooks are red. The number of red notebooks is thrice the number of purple notebooks. What fraction of the notebooks is blue?
Red |
Purple |
Blue |
Total |
2x3 |
3x3 |
5x3 |
3x2 |
1x2 |
|
|
6 u |
2 u |
7 u |
15 u |
Number of red notebooks is the repeated identity.
Make the number of red notebooks the same.
LCM of 2 and 3 = 6
Number of blue notebooks
= 15 u - 6 u - 2 u
= 7 u
Fraction of the notebooks that is blue
=
715 Answer(s):
715