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:

o=12 m  2(a+b)=o a=2b=4 m 2(a+b)=12 a=2b  2⋅ (a+b)=12 a=2⋅ b  2a+2b=12 a−2b=0  a=4 b=2

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