The perimeter of a rectangle is 20 meters and the width is 5/8 of the length. If the length and width are each increased by 1 meter, the area of the resulting large rectangle is increased by how many square meters compared with the area of the original rectangle.
一个长方形的周长是20米，宽是长的5/8．长、宽各增加1米，得到的大长方形面积比原来长方形面积增加了多少平方米．
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 + (5/8)</gadget>
<output>13/8 = around 1.625</output>

<gadget id="calculator">20 / 2 / (13/8)</gadget>
<output>80/13 = around 6.153846</output>

<gadget id="calculator">(80/13) + 1</gadget>
<output>93/13 = around 7.153846</output>

<gadget id="calculator">(80/13) * (5/8)</gadget>
<output>50/13 = around 3.846154</output>

<gadget id="calculator">(50/13) + 1</gadget>
<output>63/13 = around 4.846154</output>

<gadget id="calculator">(93/13) * (63/13)</gadget>
<output>5_859/169 = around 34.668639</output>

<gadget id="calculator">(80/13) * (80/13) * (5/8)</gadget>
<output>4_000/169 = around 23.668639</output>

<gadget id="calculator">(5_859/169) - (4_000/169)</gadget>
<output>11</output>

<result>11</result>