Approximately 4.6 Kg/m to 2 decimal ,places
The shortcut method is based on what follows:
I will highlight in red the bit that the shortcut method uses.
Using ratios in fractional format.
Lookin at the units to decide how we write this. We are told
'mass per metre' so this is written as:
The word 'per' means for each of 1. So 'per metre' is for each of 1 metre
Thus we need to change the
So we multiply top and bottom of
To determine the mass for one metre apply
Now you see where the shortcut approach comes from
This produces a decimal solution which I am choosing to be rounded, so not precise.
Or you can write: