Both A and B complete tasks A and B at the same time. It takes 29 days for A to complete work A on a sunny day, and the work efficiency is reduced by 20% in rainy days. It takes 32 days for B to complete work B in sunny days, and the work efficiency is reduced by 10% in rainy days. Later, they both start work at the same time and finish work at the same time. sky?
甲乙两人同时完成A、B两项工作．甲在晴天完成A工作需29天，在雨天工作效率降低20%，乙在晴天完成B要32天，在雨天工作效率降低10%，后来两人同时开工，又同时完工，开工内雨天有几天？
<gadget id="calculator">1 / 29</gadget>
<output>1/29 = around 0.034483</output>

<gadget id="calculator">1 / 32</gadget>
<output>1/32 = around 0.03125</output>

<gadget id="calculator">(1/29) - (1/32)</gadget>
<output>3/928 = around 0.003233</output>

<gadget id="calculator">9 / 320</gadget>
<output>9/320 = around 0.028125</output>

<gadget id="calculator">(9/320) * (1/29)</gadget>
<output>9/9_280 = around 0.00097</output>

<gadget id="calculator">4 / 145</gadget>
<output>4/145 = around 0.027586</output>

<gadget id="calculator">(4/145) * (1/32)</gadget>
<output>1/1_160 = around 0.000862</output>

<gadget id="calculator">(9/9_280) - (1/1_160)</gadget>
<output>1/9_280 = around 0.000108</output>

<gadget id="calculator">(3/928) / (1/9_280)</gadget>
<output>30</output>

<result>30</result>