英语翻译A rectangular pool is 8m wide and 12m long.A concrete wa

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英语翻译
A rectangular pool is 8m wide and 12m long.A concrete walk of uniform width surrounds the pool.If the total area of the pool and the wald is 320 square meters,how many meters wide is the walk?(请先翻译)

一个矩形游泳池8米宽,12米长.一条等宽的混凝土走道围绕着它.如果游泳池和走道的总面积是320平方米,问走道多宽?
设走道宽x米,那末
（12+x) * (8+x) = 320
x=8
答：走道宽8米.

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