If the length of a side of a square is increased by 3 centimeter, the perimeter of the new square is 40 centimeters more than twice the length of the side of the original square. Find the length of the side of the original square.
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If the length of a side of a square is increased by 3 centimeter, the perimeter of the new square is 40 centimeters more than twice the length of the side of the original square. Find the length of the side of the original square.
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Let $\displaystyle x$ be the side length of the original square.
Let $\displaystyle P$ be the perimeter of the new square
Then $\displaystyle P = 4(x + 3)$
Now we are told that $\displaystyle P = 2x + 40$
$\displaystyle \Rightarrow 4(x + 3) = 2x + 40$
Now we just solve for $\displaystyle x$. I think you can take it from here