Rectangle from string

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

Correct answer:

a =  4 m
b =  2 m

Step-by-step explanation:

o=12 m  2(a+b)=o a=2b 2(a+b)=12 a=2b  2 (a+b)=12 a=2 b  2a+2b=12 a2b=0  Row221 Row1Row2 2a+2b=12 3b=6  b=36=2 a=2122b=2122 2=4  a=4 b=2

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