For a piece of colored cloth, cut off the full length (1/5) for the first time by 4 cm, and cut off the remaining (1/4) by 5 cm for the second time, leaving half of the original length plus 10 cm. How long was the cloth originally?
一条彩色布条，第一次剪去全长的(1/5)多4厘米，第二次剪去余下的(1/4)少5厘米，还剩下最初长度的一半多10厘米．这条布原来有多长？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">4 * (1/4)</gadget>
<output>1</output>

<gadget id="calculator">10 - 1 - 5</gadget>
<output>4</output>

<gadget id="calculator">4 + 4</gadget>
<output>8</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * (1/4)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/20) - (1/5) - (1/4) - (1/2)</gadget>
<output>-9/10 = around -0.9</output>

<gadget id="calculator">1 + (-9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">8 / (1/10)</gadget>
<output>80</output>

<result>80</result>