A rectangle is 30 decimeters long and 5 decimeters greater than its width. What is the area of the rectangle?
一个长方形长30分米，比宽多5分米，这个长方形的面积是多少？
<gadget id="calculator">30 - 5</gadget>
<output>25</output>

<gadget id="calculator">30 * 25</gadget>
<output>750</output>

<result>750</result>