exam Maths Puzzle Numerical Ability

Can someone help me show the number is rational by writing it as a quotient of two integers:

0.37

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exam Other Question

I know there is a help which can be used for solving quadratic equations, but I'm not sure how it works. Can you give that information and explain the process. It's something lik A garden area is 30ft. long and 20ft. wide. A path of uniform width is set around the edge. If the remaining garden is 400ft.^2, what is the width of the path?