The length of the room is 3 times the width and the total area of the room is 27 square meters. What is the length of the living

room?

1 answer:

7 0

$l=3w\\
lw=27\\\\
3w\cdot w=27\\
3w^2=27\\
w^2=9\\
w=3 \vee w=-3\\
-3\not\in\mathbb{N}\\\\
l=3\cdot3\\
l=9
$

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