A specific shade of purple paint requires mixing red paint and blue paint in a ratio of 5 parts red to 3 parts blue. If you need a larger amount of this purple paint and use 10 parts of red paint, which of the following describes the amount of blue paint you should use?
Exactly 10 parts
3 parts more than the amount of blue paint used with 5 parts red paint
5/3 times the amount of red paint used with 3 parts blue paint
3/5 times the amount of red paint used in this batch
