There is a batch of flour in the warehouse, and the quality sold on the first day is 25 tons less than half of the total. The quality sold on the second day was 15 tons more than half of that left on the first day. As a result, there were 19 tons left. How many tons of flour is there in this warehouse?
仓库里有一批面粉，第一天售出的质量比总数的一半少25吨．第二天售出的质量比第一天剩下了一半多15吨．结果还剩下19吨．这个仓库原有面粉多少吨？
<gadget id="calculator">19 + 15</gadget>
<output>34</output>

<gadget id="calculator">34 * 2</gadget>
<output>68</output>

<gadget id="calculator">68 - 25</gadget>
<output>43</output>

<gadget id="calculator">43 * 2</gadget>
<output>86</output>

<result>86</result>