When two squares of the same size are put together to form a rectangle, the perimeter is 10 meters less than the sum of the perimeters of the original two squares. What is the perimeter of a square in decimeters?
把两个大小相同的正方形拼成一个长方形后，周长比原来两个正方形的周长和减少10米．原来一个正方形的周长是多少分米．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 10 * 4</gadget>
<output>200</output>

<result>200</result>