800 bags of cement were shipped to the construction site, used (2/5) in the first week and used (3/8) in the second week, how many bags are left?
工地上运来800包水泥，第一周用去(2/5)，第二周用去(3/8)，还剩下多少包？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (2/5) - (3/8)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">800 * (9/40)</gadget>
<output>180</output>

<result>180</result>