Question

The ratio of a feild is its width is 5:3 . Find its length if the width is 42 metrs .

Answer 1

Let the length and width of the field be 5x and 3x respectively.

According this question.....  

3x=42

x=14

Then length= 5x=5*14

Hence length=70

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Answer 2

let the common will beX
according to the question............
length=5X
breath=3X
$5x + 3x = 42$
$3x = 42$
$x = \frac{42}{3}$
$x = 14$
length=5X=5x14
therefore the length is 70cm