How do indicators work when they mixed with each other? Methyl orange, bromothymol blue and phenolphthalein indicators were mixed together to form a solution. 



Over what pH range would the solution be yellow? 

I cannot understand the question. If two or more different indicators are mixed, do they still work as indicators? Because each their colours will blend with each other and result to formation of a new colour, how can we know what the color will be?
In general, the chemistry of one indicator does not usually affect another as far as I know, but the colors will mix as you would expect. It gets tricky here because the question shows the colored ranges but leaves a blank in the transition pH ranges, but I would guess the answer they're looking for is from 3-7.5