A rectangle is surrounded by a piece of iron wire, the length is 5 meters and the width is 2.5 times. If this and the iron wire form a square, what is the side length of the square?
用一根铁丝围成一个长方形，长是5米，是宽的2.5倍．如果把这跟铁丝围成一个正方形，正方形的边长是多少厘米．
<gadget id="calculator">5 / 2.5</gadget>
<output>2</output>

<gadget id="calculator">2 + 5</gadget>
<output>7</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">7 * (1/2) * 100</gadget>
<output>350</output>

<result>350</result>