The trick to this exercise is that the 98% 2% ratio is just made up and that will really blow the persons mind that says red hammer. You can do the same thing by asking the question at the end of the equations " name a vegetable" then use carrot as the answer.
Had the question said "Think of a colored tool" my answer would have been different but it said a color and a tool so I came up with green linemans... but I was picturing blue linemans in my head.
BTW, why a red hammer? I almost never see colored hammers as they are typically metal or have wood handles. Granted many fiberglass hammers are red but if someone asked me to picture a hammer it wouldn't be colored.