exam Maths Puzzle Numerical Ability

A garden area is 30ft long and 20 ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400ft^2, what is the width of the path?

No clue how to even come up with equation - please help!

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exam Other Question

I need to insert parentheses in the equation to make it true:

30 divided by 2 + 4 x 2 + 7 = 10

and

30 divided by 2 + 4 x 2 + 7 = 51 employees of a discount appliance store receive an additional 20% off of the lowest price on an item. IF an employee purchase a dishwasher during a 15% off sales, HOW MUCH WILL PAY IF THE DISWASHER ORIGINALLY COST $450?