Rectangle from string

String 12m. Make rectangle when one side is two times longer than its width.

Correct answer:

a =  4 m
b =  2 m

Step-by-step explanation:

$$\begin{gathered} o=12\text{ m } \\ 2(a+b)=o \\ a=2b \\ 2(a+b)=12 \\ a=2b \\ 2\cdot (a+b)=12 \\ a=2\cdot b \\ 2a+2b=12 \\ a-2b=0 \\ a=4=4\text{ m } \\ b=2 \end{gathered}$$

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