A plot of land in the form of a rectangle has a dimension 120 m × 160 m. A drain let of 10 m wide is dug all around it (on the outside) and the earth dug out is evenly spread over the plot, increasing its surface level by 20 cm. Find the depth of the drainlet.
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probably I don't know
thelifechangingcomic:
Probably I think you're an idiot
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