rectangular piece of white paper has a circumference of 16.8 cm and its length is 2.4 cm more than its width. What is its area?
一张长方形的白纸周长是16.8厘米，长比宽多2.4厘米，它的面积是多少．
<gadget id="calculator">16.8 / 2</gadget>
<output>8.4</output>

<gadget id="calculator">8.4 - 2.4</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 + 2.4</gadget>
<output>5.4</output>

<gadget id="calculator">5.4 * 3</gadget>
<output>16.2</output>

<result>16.2</result>