exam Maths Puzzle Numerical Ability

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 squared.what is the width of the path?

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find the order-pair solution of y=-3x + 1 that corresponds to x=0 A student did a word processing job for $24. It took him 1 hour longer than he expected, and therefore he earned $4 less an hour than he anticipated. How long did he expect that it would take to do the job?