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Maths Puzzle
Numerical Ability
What is the formula to calculate the surface area in mē for a length of pipe. I have the diameter in inches and length in metres.
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The strength of a steel bar is proporitional to its cross-sectional area. A steel bar is 3/4 in. wide and 1/2 in. thick. How many times stronger tyhan this bar is a steel bar thet is 1.5 in. wide and 1.5 in. thick?
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