rectangular piece of paper has a circumference of 160 cm and a ratio of length to width of 5:3. If you cut it into the largest square piece of paper, what is the area of this square piece of paper?
一张长方形的纸片，周长是160厘米，长和宽的比是5：3．如果剪成一个最大的正方形纸片，这张正方形纸片的面积是多少平方厘米？
<gadget id="calculator">160 / 2</gadget>
<output>80</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">80 * (3/8)</gadget>
<output>30</output>

<gadget id="calculator">30 ** 2</gadget>
<output>900</output>

<result>900</result>