exam Maths Puzzle Numerical Ability

A PICTURE THAT MEASURES 12 CM BY 18 CM IS ENLARGED TO FOUR TIMES ITS AREA. WHAT ARE THE NEW DIMENSIONS OF THE PICTURE?

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exam Other Question

a garden area is 30ft long and 20ft wide. A path uniform width is set around the edge. if the remaining garden is 400 ft squared, what is the width of the path Please someone help...I've been trying to figure where I'm going wrong....I get almost to the end and my last fraction is always wrong...so I'm not multiping somewhere right....