If the ratio of the length and breadth of a rectangle is 7:3 and its perimeter is 140 cm find the area of the rectangle
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let ratio constant be x
so l= 7x and b= 3x
perimeter= 2* l+b = 140
2*10x= 140
x= 7cm
l= 7*7= 49 cm
b= 3*7 = 21 cm
area of rectangle = l*b = 49*21= 1029 Sqcm
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