Question

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

Answer 1

Let us assume the length of paper to be 7x and width of paper to be 5x.

Width of paper= 20.5 cm
5x= 20.5
x= 20.5/5
 =4.1cm

Length of paper= 7x
                         = 7*4.1
                         =28.7 cm

Ans- Therefore, the length of the sheet is 28.7 cm.

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Answer 2

solution
let the sheet of paper be x
width = x : 20.5
according to the question
x :20.5 = 7:5
5×x = 20.5 × 7
x = 20.5 ×7 /5
28.7
Hence the length of the sheet of paper is 28.7
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