The cafeteria buys a batch of flour, eat the stock of the day (1/10) on the first day, eat (1/9) of the stock on the second day, and eat (1/9) of the stock of the day every day for the next 7 days 8), (1/7), (1/6), ..., (1/3), (1/2). Finally, I ate 4 bags on the tenth day and just finished eating. How many bags of this batch of flour were there originally?
食堂买来一批面粉，第一天吃去当天库存数(1/10)，第二天吃去当天库存数的(1/9)，以后7天，每天吃去当天库存数的(1/8)，(1/7)，(1/6)，…，(1/3)，(1/2)．最后，第十天吃了4袋，正好吃完．这批面粉原来有多少袋？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 4</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">1 / 5</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">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 - (1/9)</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">4 / (1/2) / (2/3) / (3/4) / (4/5) / (5/6) / (6/7) / (7/8) / (8/9) / (9/10)</gadget>
<output>40</output>

<result>40</result>