The length of a rectangle is increased to 5 times its original size, its width is increased to 2 times its original size, and its area is increased to how many times its original size.
一个长方形的长扩大到原来的5倍，宽扩大到原来的2倍，面积扩大到原来的多少倍．
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>