The factory produces a batch of products, which was originally planned to be completed in 15 days. The production process was improved during actual production, and the number of products produced per day was 10 more than the original plan (5/11). As a result, the production task was completed 4 days ahead of schedule. How many pieces are there in this batch?
工厂生产一批产品，原计划15天完成．实际生产时改进了生产工艺，每天生产产品的数量比原计划每天生产产品数量的(5/11)多10件，结果提前4天完成了生产任务．则这批产品有多少件．
<gadget id="calculator">10 * 15</gadget>
<output>150</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">150 - 40</gadget>
<output>110</output>

<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">(5/11) * 4</gadget>
<output>20/11 = around 1.818182</output>

<gadget id="calculator">(5/11) * 15</gadget>
<output>75/11 = around 6.818182</output>

<gadget id="calculator">(20/11) - (75/11)</gadget>
<output>-5</output>

<gadget id="calculator">15 + (-5)</gadget>
<output>10</output>

<gadget id="calculator">110 / 10</gadget>
<output>11</output>

<gadget id="calculator">11 * 15</gadget>
<output>165</output>

<result>165</result>