Question

The ratio of the length of a field to its width is 5:3 find its length if the width is 42 meters??

Answer 1

let the length be 5x and width be 3x respectively
as given in question width is 42 metres but 
width is 3x 
∴ 3x=42 
x= 42/3 = 14 
if x is 14 then length = 5x
                               = 5×14
                                =70metres  

Answer 2

length=5x
width=3x
value of x
3x=42
x=42÷3
x=14metres
length=5x
=5×14
=70metres