exam Maths Puzzle Numerical Ability

The circumference of a circle is 5/2 pi. What is the diameter of the circle?

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exam Other Question

Construction. A garden area is 30 ft long and 20 ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400 ft^2, what is the width of the path? Please help me I am unable to slove this expression.
-9-sqrt108 /3