Question

The ratio between the length and width of a rectangular sheet of paper is 7:5. If width of the sheet is 20.5 cm, find its length

Answer 1

then the length = 28.7cm
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Answer 2

the ratio of
length to its width I 7:5

the width is 20.5 cm

let the length be x

$\frac{7}{5} = \frac{x}{20.5}$
20.5*7=5x

x=
$\frac{20.5 \times 7}{5} = x$

x=4.1*7

x=28.7cm

the length of the rectangle is 28.7cm