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[" 39.There is a rectangular tank of "],[" length "180m" and breadth "120],[m" in a circular field,If the area "],[" ot the land portion of the field "],[" is "40000m^(2)" ,what is the radius "],[" of the field? ( Take "pi=(22)/(7)" ) "],[[" (a) "130m," (b) "135m],[" (c) "140m," (d) "145m]]

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