Question

6 metres cost 3.00. what is the cost of 1 metre?

Answer 1

3/6 = 0.5 for 1 metre 

Answer 2

6 metres - 3.00
1 metre - x

$6 \cdot x = 1 \cdot 3 \\ 6x=3 \\ x=\frac{3}{6}=\frac{1}{2}=0.5$

1 metre costs 0.5.