[One, Two, Middlesboogie]

Not sure about red being the 'dominant' colour. It has the longest wavelength, and food items packaged in red tend to sell better than in other colours, but our brains are actually better at seeing green. Humans can see more different shades of green than any other colour, which is why night-vision goggles show everything in green.

Doing maths, however, does make your brain think of red and orange (but orange more so). This is why, if you'd asked somebody the above maths questions and then told them to quickly think of a vegetable, they'd likely say 'carrot'.

Like most people, I unconsciously thought of orange. But my dad has a screwdriver with an orange handle that he's had as long as I can remember, so when I read 'tool' while thinking of 'orange', 'screwdriver' was the first thing I thought of.

Why are people most likely to say 'hammer'? I use screwdrivers and saws far more than I use hammers.