A rectangle is 9 decimeters long and 4 decimeters longer than its width, what is its area in square meters?
一个长方形长9分米，比宽长4分米，它的面积是多少平方米．
<gadget id="calculator">9 - 4</gadget>
<output>5</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">9 * (1/20)</gadget>
<output>9/20 = around 0.45</output>

<result>9/20 = around 0.45</result>