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1 . What is the thikness of a pipe that has an outer diameter of 2.5 inches and inner diameter of 2.1 inches?

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Answer: Option A

Explanation:

Consider going across the width of the pipe:

Outer diameter = Thickness + Inner diameter + Thickness

so 2*Thickness = Outer diameter - Inner diameter = 2.5 - 2.1 = 0.4 inches

and therefore, Thickness = 0.2 inches.