Question
There were some purple, grey and brown files in a box. 211 of the files were grey. The ratio of the number of purple files to the number of brown files was 4 : 5. There were 318 fewer grey files than brown files.
  1. Find the ratio of the number of purple files to the number of grey files to the number of brown files in the box.
  2. How many brown files were there?
4 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

There were some purple, grey and brown files in a box. 211 of the files were grey. The ratio of the number of purple files to the number of brown files was 4 : 5. There were 318 fewer grey files than brown files.
  1. Find the ratio of the number of purple files to the number of grey files to the number of brown files in the box.
  2. How many brown files were there?