noose the correct answer in each of the following: The sides of a retangle are in the ratio 8: 7 and its perimeter is 90 cm. The length of the retangle is
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l:B = 8:7
l = 8x
b = 7x
perimeter = 2(l+b) = 2(8x+7x) = 2*15x =30x
30x = 90
x = 3
l= 8×3 =24cm
b=7×3 =21cm
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