Question
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?
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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?