What is the benefit of mixing two primary colours in equal amounts?

Correct answer: A clear secondary colour may be obtained

Mixing two primary pigments in approximately equal amounts gives the two components similar influence, so it can produce a clear, balanced secondary colour. For example, equal red and yellow can make orange, while equal yellow and blue can make green. The exact result depends on pigment strength, so “may be obtained” is precise. Equal mixing does not always produce black, erase colour or change paper thickness.