A batch of table salt is shipped from the Hongyun store, all (1/5) is sold on the first day, and the rest (1/2) is sold on the second day. There are still 50 bags left. How many bags are there in this batch of salt?
宏运商店运来一批食盐，第一天卖出全部的(1/5)，第二天卖出剩下的(1/2)，还剩下50袋，这批盐共有多少袋．
<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 / 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">50 / (1/2) / (4/5)</gadget>
<output>125</output>

<result>125</result>