The length of the rectangle increases (1/3), and the width also increases (1/3), how much does the area increase from the original.
长方形长增加(1/3)，宽也增加(1/3)，面积比原来增加多少．
<gadget id="calculator">16 / 9</gadget>
<output>16/9 = around 1.777778</output>

<result>16/9 = around 1.777778</result>