A canteen uses 1/2 of the total amount of flour in the first week, and the ratio of the amount used to the total amount of flour in the second week is 3:10, and there are 50 bags left. How many bags of flour are shared between the first week and the second week?
某食堂第一周用去面粉总数的(1/2)，第二周用去的与面粉总数的比是3：10，还剩50袋，第一周和第二周一共用去面粉多少袋？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (1/2) - (3/10)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">50 / (1/5)</gadget>
<output>250</output>

<gadget id="calculator">250 - 50</gadget>
<output>200</output>

<result>200</result>