Xiaohong and Xiaoming do the same number of oral arithmetic problems. When Xiaohong completes 25% of the task, Xiaoming has 260 questions left to solve: when Xiaohong completes the remaining 80%, Xiaoming still has his own tasks left 20% didn't do it. How many cross-country calculations do the two of them have to do?
小红和小明做同样多的口算题，当小红做完成任务的25%时，小明还剩下260道题没有做：当小红完成剩下的80%时，小明还剩下自己任务的20%没有做．两人各要做多少道口算题？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(3/4) * (4/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) + (1/4)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(17/20) / (4/5)</gadget>
<output>17/16 = around 1.0625</output>

<gadget id="calculator">1 / (17/16)</gadget>
<output>16/17 = around 0.941176</output>

<gadget id="calculator">(1/4) * (16/17)</gadget>
<output>4/17 = around 0.235294</output>

<gadget id="calculator">1 - (4/17)</gadget>
<output>13/17 = around 0.764706</output>

<gadget id="calculator">260 / (13/17)</gadget>
<output>340</output>

<result>340</result>