book Maths Puzzle Numerical Ability

If they give you a problem that said dreaw on the number like that flooling set [-2,7) upside down U [5,10]
what does the u or upside down u mean

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Walnuts sell for $2.00 per pound and Pecans for $2.25 per pound. You plan to mix 160 pounds of walnuts. How many pounds of Pecans should be mixed to produce a mixture that sells Hello, I"m not sure if this is the right topic for this but how do you tell what property or like reflexive, substitution, transitive, and so on how can you tell what you use for e