Question
PSLE
John kept files in boxes X and Y. Box X contained thrice as many files as box Y. In box X, 15 of the files were yellow files. In box Y, 12 of the files were yellow files. What fraction of John's files were yellow files?
2 m

Click button first when a symbol is required. X

PSLE
John kept files in boxes X and Y. Box X contained thrice as many files as box Y. In box X, 15 of the files were yellow files. In box Y, 12 of the files were yellow files. What fraction of John's files were yellow files?