Length and Breath of Rectangle

The length and breath of of a rectangle is in the ratio 7:5.if the length decreases by 5 and the breath increases by 2,then the area of it was 65 sqkm.then find the actual length and breath of the rectangle.
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The formula for area of rectangle is breath*length. It is given that l/b=7/5
From that l=7/5*b
Length decreases by 5 and breath increases by 2.
so now the new area will be A=(l-5)*(b+2)
sub the value of l above equation then, A=(7/5b-5)(b+2)
The given new area s 65sqkm.sub area n above eqn form the equation get the value of b and l.

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