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according to the diagram, we get the new length and breadth as 15+2x , 10+2x
so perimeter is =2*(15+2x+10+2x)
66=2*(25+4x)
x=2 m
so concrete width is 2m
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king1818:
why 15 + 2x
on either side of the rectangle, we have the width of the concrete
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