A rectangle whose length is increased by 2 meters and whose width is increased by 5 meters becomes a square. How many meters is the length of the original rectangle greater than its width?
一个长方形，长增加2米宽增加5米，就成了一个正方形，原长方形的长比宽多多少米．
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<result>3</result>